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Finding the Fourth Proportional to 653.41, 980.30 and 345.19

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Solution

The fourth proportional to 653.41, 980.30 and 345.19 is: 517.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    653.41 : 980.30 = 345.19 : x
  2. Step 2: Convert to fraction form
    653.41/980.30 = 345.19/x
  3. Step 3: Cross multiply
    653.41x = 980.30 × 345.19
  4. Step 4: Simplify right side
    653.41x = 338,389.76
  5. Step 5: Solve for x
    x = 338,389.76/653.41
  6. Step 6: Final answer
    x = 517.88

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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.