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Finding the Fourth Proportional to 1,539.15, 2,309.15 and 499.20

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Solution

The fourth proportional to 1,539.15, 2,309.15 and 499.20 is: 748.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,539.15 : 2,309.15 = 499.20 : x
  2. Step 2: Convert to fraction form
    1,539.15/2,309.15 = 499.20/x
  3. Step 3: Cross multiply
    1,539.15x = 2,309.15 × 499.20
  4. Step 4: Simplify right side
    1,539.15x = 1,152,725.18
  5. Step 5: Solve for x
    x = 1,152,725.18/1,539.15
  6. Step 6: Final answer
    x = 748.94

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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.