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Finding the Fourth Proportional to 1,125.60, 1,687.80 and 509.19

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Solution

The fourth proportional to 1,125.60, 1,687.80 and 509.19 is: 763.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,125.60 : 1,687.80 = 509.19 : x
  2. Step 2: Convert to fraction form
    1,125.60/1,687.80 = 509.19/x
  3. Step 3: Cross multiply
    1,125.60x = 1,687.80 × 509.19
  4. Step 4: Simplify right side
    1,125.60x = 859,410.88
  5. Step 5: Solve for x
    x = 859,410.88/1,125.60
  6. Step 6: Final answer
    x = 763.51

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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.