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Finding the Fourth Proportional to 718.69, 991.79 and 470.42

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Solution

The fourth proportional to 718.69, 991.79 and 470.42 is: 649.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.69 : 991.79 = 470.42 : x
  2. Step 2: Convert to fraction form
    718.69/991.79 = 470.42/x
  3. Step 3: Cross multiply
    718.69x = 991.79 × 470.42
  4. Step 4: Simplify right side
    718.69x = 466,561.51
  5. Step 5: Solve for x
    x = 466,561.51/718.69
  6. Step 6: Final answer
    x = 649.19

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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.