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Finding the Fourth Proportional to 1,122.90, 1,681.38 and 815.46

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Solution

The fourth proportional to 1,122.90, 1,681.38 and 815.46 is: 1,221.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,122.90 : 1,681.38 = 815.46 : x
  2. Step 2: Convert to fraction form
    1,122.90/1,681.38 = 815.46/x
  3. Step 3: Cross multiply
    1,122.90x = 1,681.38 × 815.46
  4. Step 4: Simplify right side
    1,122.90x = 1,371,098.13
  5. Step 5: Solve for x
    x = 1,371,098.13/1,122.90
  6. Step 6: Final answer
    x = 1,221.03

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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.