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Finding the Fourth Proportional to 718.86, 1,073.28 and 621.24

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Solution

The fourth proportional to 718.86, 1,073.28 and 621.24 is: 927.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.86 : 1,073.28 = 621.24 : x
  2. Step 2: Convert to fraction form
    718.86/1,073.28 = 621.24/x
  3. Step 3: Cross multiply
    718.86x = 1,073.28 × 621.24
  4. Step 4: Simplify right side
    718.86x = 666,764.47
  5. Step 5: Solve for x
    x = 666,764.47/718.86
  6. Step 6: Final answer
    x = 927.53

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.