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Finding the Fourth Proportional to 720.24, 1,080.44 and 621.76

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Solution

The fourth proportional to 720.24, 1,080.44 and 621.76 is: 932.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.24 : 1,080.44 = 621.76 : x
  2. Step 2: Convert to fraction form
    720.24/1,080.44 = 621.76/x
  3. Step 3: Cross multiply
    720.24x = 1,080.44 × 621.76
  4. Step 4: Simplify right side
    720.24x = 671,774.37
  5. Step 5: Solve for x
    x = 671,774.37/720.24
  6. Step 6: Final answer
    x = 932.71

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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.