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Finding the Fourth Proportional to 1,125.65, 1,687.97 and 509.33

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Solution

The fourth proportional to 1,125.65, 1,687.97 and 509.33 is: 763.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,125.65 : 1,687.97 = 509.33 : x
  2. Step 2: Convert to fraction form
    1,125.65/1,687.97 = 509.33/x
  3. Step 3: Cross multiply
    1,125.65x = 1,687.97 × 509.33
  4. Step 4: Simplify right side
    1,125.65x = 859,725.32
  5. Step 5: Solve for x
    x = 859,725.32/1,125.65
  6. Step 6: Final answer
    x = 763.76

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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.