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Finding the Fourth Proportional to 2,862.40, 4,289.55 and 1,129

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Solution

The fourth proportional to 2,862.40, 4,289.55 and 1,129 is: 1,691.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,862.40 : 4,289.55 = 1,129 : x
  2. Step 2: Convert to fraction form
    2,862.40/4,289.55 = 1,129/x
  3. Step 3: Cross multiply
    2,862.40x = 4,289.55 × 1,129
  4. Step 4: Simplify right side
    2,862.40x = 4,842,901.95
  5. Step 5: Solve for x
    x = 4,842,901.95/2,862.40
  6. Step 6: Final answer
    x = 1,691.90

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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.