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Finding the Fourth Proportional to 716.40, 988.56 and 638.08

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Solution

The fourth proportional to 716.40, 988.56 and 638.08 is: 880.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    716.40 : 988.56 = 638.08 : x
  2. Step 2: Convert to fraction form
    716.40/988.56 = 638.08/x
  3. Step 3: Cross multiply
    716.40x = 988.56 × 638.08
  4. Step 4: Simplify right side
    716.40x = 630,780.36
  5. Step 5: Solve for x
    x = 630,780.36/716.40
  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.