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Finding the Fourth Proportional to 718.19, 991.13 and 407.69

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Solution

The fourth proportional to 718.19, 991.13 and 407.69 is: 562.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.19 : 991.13 = 407.69 : x
  2. Step 2: Convert to fraction form
    718.19/991.13 = 407.69/x
  3. Step 3: Cross multiply
    718.19x = 991.13 × 407.69
  4. Step 4: Simplify right side
    718.19x = 404,073.79
  5. Step 5: Solve for x
    x = 404,073.79/718.19
  6. Step 6: Final answer
    x = 562.63

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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.