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Finding the Fourth Proportional to 1,125.94, 1,689.30 and 509.92

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Solution

The fourth proportional to 1,125.94, 1,689.30 and 509.92 is: 765.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,125.94 : 1,689.30 = 509.92 : x
  2. Step 2: Convert to fraction form
    1,125.94/1,689.30 = 509.92/x
  3. Step 3: Cross multiply
    1,125.94x = 1,689.30 × 509.92
  4. Step 4: Simplify right side
    1,125.94x = 861,407.86
  5. Step 5: Solve for x
    x = 861,407.86/1,125.94
  6. Step 6: Final answer
    x = 765.06

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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.