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Finding the Fourth Proportional to 716.03, 990.29 and 642.32

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Solution

The fourth proportional to 716.03, 990.29 and 642.32 is: 888.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    716.03 : 990.29 = 642.32 : x
  2. Step 2: Convert to fraction form
    716.03/990.29 = 642.32/x
  3. Step 3: Cross multiply
    716.03x = 990.29 × 642.32
  4. Step 4: Simplify right side
    716.03x = 636,074.91
  5. Step 5: Solve for x
    x = 636,074.91/716.03
  6. Step 6: Final answer
    x = 888.34

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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.