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Finding the Fourth Proportional to 1,387.29, 2,080.52 and 509.59

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Solution

The fourth proportional to 1,387.29, 2,080.52 and 509.59 is: 764.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387.29 : 2,080.52 = 509.59 : x
  2. Step 2: Convert to fraction form
    1,387.29/2,080.52 = 509.59/x
  3. Step 3: Cross multiply
    1,387.29x = 2,080.52 × 509.59
  4. Step 4: Simplify right side
    1,387.29x = 1,060,212.19
  5. Step 5: Solve for x
    x = 1,060,212.19/1,387.29
  6. Step 6: Final answer
    x = 764.23

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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.