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Finding the Fourth Proportional to 1,539.62, 2,124.72 and 876.50

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Solution

The fourth proportional to 1,539.62, 2,124.72 and 876.50 is: 1,209.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,539.62 : 2,124.72 = 876.50 : x
  2. Step 2: Convert to fraction form
    1,539.62/2,124.72 = 876.50/x
  3. Step 3: Cross multiply
    1,539.62x = 2,124.72 × 876.50
  4. Step 4: Simplify right side
    1,539.62x = 1,862,317.08
  5. Step 5: Solve for x
    x = 1,862,317.08/1,539.62
  6. Step 6: Final answer
    x = 1,209.60

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.