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Finding the Fourth Proportional to 716.06, 987.76 and 638.30

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Solution

The fourth proportional to 716.06, 987.76 and 638.30 is: 880.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    716.06 : 987.76 = 638.30 : x
  2. Step 2: Convert to fraction form
    716.06/987.76 = 638.30/x
  3. Step 3: Cross multiply
    716.06x = 987.76 × 638.30
  4. Step 4: Simplify right side
    716.06x = 630,487.21
  5. Step 5: Solve for x
    x = 630,487.21/716.06
  6. Step 6: Final answer
    x = 880.49

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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.