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Finding the Fourth Proportional to 978.73, 1,470.89 and 815.22

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Solution

The fourth proportional to 978.73, 1,470.89 and 815.22 is: 1,225.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    978.73 : 1,470.89 = 815.22 : x
  2. Step 2: Convert to fraction form
    978.73/1,470.89 = 815.22/x
  3. Step 3: Cross multiply
    978.73x = 1,470.89 × 815.22
  4. Step 4: Simplify right side
    978.73x = 1,199,098.95
  5. Step 5: Solve for x
    x = 1,199,098.95/978.73
  6. Step 6: Final answer
    x = 1,225.16

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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.