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Finding the Fourth Proportional to 718.58, 991.90 and 424.02

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Solution

The fourth proportional to 718.58, 991.90 and 424.02 is: 585.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.58 : 991.90 = 424.02 : x
  2. Step 2: Convert to fraction form
    718.58/991.90 = 424.02/x
  3. Step 3: Cross multiply
    718.58x = 991.90 × 424.02
  4. Step 4: Simplify right side
    718.58x = 420,585.44
  5. Step 5: Solve for x
    x = 420,585.44/718.58
  6. Step 6: Final answer
    x = 585.30

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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.