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Finding the Fourth Proportional to 718.79, 991.98 and 424.22

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Solution

The fourth proportional to 718.79, 991.98 and 424.22 is: 585.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.79 : 991.98 = 424.22 : x
  2. Step 2: Convert to fraction form
    718.79/991.98 = 424.22/x
  3. Step 3: Cross multiply
    718.79x = 991.98 × 424.22
  4. Step 4: Simplify right side
    718.79x = 420,812.80
  5. Step 5: Solve for x
    x = 420,812.80/718.79
  6. Step 6: Final answer
    x = 585.45

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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.