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Finding the Fourth Proportional to 719.20, 991.12 and 553.92

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Solution

The fourth proportional to 719.20, 991.12 and 553.92 is: 763.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    719.20 : 991.12 = 553.92 : x
  2. Step 2: Convert to fraction form
    719.20/991.12 = 553.92/x
  3. Step 3: Cross multiply
    719.20x = 991.12 × 553.92
  4. Step 4: Simplify right side
    719.20x = 549,001.19
  5. Step 5: Solve for x
    x = 549,001.19/719.20
  6. Step 6: Final answer
    x = 763.35

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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.