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Finding the Fourth Proportional to 924.56, 1,380.07 and 815.22

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Solution

The fourth proportional to 924.56, 1,380.07 and 815.22 is: 1,216.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    924.56 : 1,380.07 = 815.22 : x
  2. Step 2: Convert to fraction form
    924.56/1,380.07 = 815.22/x
  3. Step 3: Cross multiply
    924.56x = 1,380.07 × 815.22
  4. Step 4: Simplify right side
    924.56x = 1,125,060.67
  5. Step 5: Solve for x
    x = 1,125,060.67/924.56
  6. Step 6: Final answer
    x = 1,216.86

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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.