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Finding the Fourth Proportional to 2,489.60, 3,731.20 and 1,029.76

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Solution

The fourth proportional to 2,489.60, 3,731.20 and 1,029.76 is: 1,543.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,489.60 : 3,731.20 = 1,029.76 : x
  2. Step 2: Convert to fraction form
    2,489.60/3,731.20 = 1,029.76/x
  3. Step 3: Cross multiply
    2,489.60x = 3,731.20 × 1,029.76
  4. Step 4: Simplify right side
    2,489.60x = 3,842,240.51
  5. Step 5: Solve for x
    x = 3,842,240.51/2,489.60
  6. Step 6: Final answer
    x = 1,543.32

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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.