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Finding the Fourth Proportional to 681.68, 939.48 and 507.08

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Solution

The fourth proportional to 681.68, 939.48 and 507.08 is: 698.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.68 : 939.48 = 507.08 : x
  2. Step 2: Convert to fraction form
    681.68/939.48 = 507.08/x
  3. Step 3: Cross multiply
    681.68x = 939.48 × 507.08
  4. Step 4: Simplify right side
    681.68x = 476,391.52
  5. Step 5: Solve for x
    x = 476,391.52/681.68
  6. Step 6: Final answer
    x = 698.85

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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.