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Finding the Fourth Proportional to 681.08, 939.76 and 470.93

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Solution

The fourth proportional to 681.08, 939.76 and 470.93 is: 649.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.08 : 939.76 = 470.93 : x
  2. Step 2: Convert to fraction form
    681.08/939.76 = 470.93/x
  3. Step 3: Cross multiply
    681.08x = 939.76 × 470.93
  4. Step 4: Simplify right side
    681.08x = 442,561.18
  5. Step 5: Solve for x
    x = 442,561.18/681.08
  6. Step 6: Final answer
    x = 649.79

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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.