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Finding the Fourth Proportional to 745.20, 1,117.80 and 660.72

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Solution

The fourth proportional to 745.20, 1,117.80 and 660.72 is: 991.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    745.20 : 1,117.80 = 660.72 : x
  2. Step 2: Convert to fraction form
    745.20/1,117.80 = 660.72/x
  3. Step 3: Cross multiply
    745.20x = 1,117.80 × 660.72
  4. Step 4: Simplify right side
    745.20x = 738,552.82
  5. Step 5: Solve for x
    x = 738,552.82/745.20
  6. Step 6: Final answer
    x = 991.08

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.