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Finding the Fourth Proportional to 125,821, 188,760.66 and 42,715

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Solution

The fourth proportional to 125,821, 188,760.66 and 42,715 is: 64,082.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    125,821 : 188,760.66 = 42,715 : x
  2. Step 2: Convert to fraction form
    125,821/188,760.66 = 42,715/x
  3. Step 3: Cross multiply
    125,821x = 188,760.66 × 42,715
  4. Step 4: Simplify right side
    125,821x = 8,062,911,591.90
  5. Step 5: Solve for x
    x = 8,062,911,591.90/125,821
  6. Step 6: Final answer
    x = 64,082.40

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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.