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Finding the Fourth Proportional to 681.42, 939.70 and 457.86

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Solution

The fourth proportional to 681.42, 939.70 and 457.86 is: 631.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.42 : 939.70 = 457.86 : x
  2. Step 2: Convert to fraction form
    681.42/939.70 = 457.86/x
  3. Step 3: Cross multiply
    681.42x = 939.70 × 457.86
  4. Step 4: Simplify right side
    681.42x = 430,251.04
  5. Step 5: Solve for x
    x = 430,251.04/681.42
  6. Step 6: Final answer
    x = 631.40

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.