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Finding the Fourth Proportional to 1,659.79, 2,489.72 and 489.67

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Solution

The fourth proportional to 1,659.79, 2,489.72 and 489.67 is: 734.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,659.79 : 2,489.72 = 489.67 : x
  2. Step 2: Convert to fraction form
    1,659.79/2,489.72 = 489.67/x
  3. Step 3: Cross multiply
    1,659.79x = 2,489.72 × 489.67
  4. Step 4: Simplify right side
    1,659.79x = 1,219,141.19
  5. Step 5: Solve for x
    x = 1,219,141.19/1,659.79
  6. Step 6: Final answer
    x = 734.52

Related Problems

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.