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Finding the Fourth Proportional to 1,122.65, 1,549.90 and 750.86

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Solution

The fourth proportional to 1,122.65, 1,549.90 and 750.86 is: 1,036.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,122.65 : 1,549.90 = 750.86 : x
  2. Step 2: Convert to fraction form
    1,122.65/1,549.90 = 750.86/x
  3. Step 3: Cross multiply
    1,122.65x = 1,549.90 × 750.86
  4. Step 4: Simplify right side
    1,122.65x = 1,163,757.91
  5. Step 5: Solve for x
    x = 1,163,757.91/1,122.65
  6. Step 6: Final answer
    x = 1,036.62

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.