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Finding the Fourth Proportional to 561.70, 842.40 and 171.70

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Solution

The fourth proportional to 561.70, 842.40 and 171.70 is: 257.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    561.70 : 842.40 = 171.70 : x
  2. Step 2: Convert to fraction form
    561.70/842.40 = 171.70/x
  3. Step 3: Cross multiply
    561.70x = 842.40 × 171.70
  4. Step 4: Simplify right side
    561.70x = 144,640.08
  5. Step 5: Solve for x
    x = 144,640.08/561.70
  6. Step 6: Final answer
    x = 257.50

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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.