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Finding the Fourth Proportional to 138,000.10, 207,000.15 and 131,439.10

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Solution

The fourth proportional to 138,000.10, 207,000.15 and 131,439.10 is: 197,158.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,000.10 : 207,000.15 = 131,439.10 : x
  2. Step 2: Convert to fraction form
    138,000.10/207,000.15 = 131,439.10/x
  3. Step 3: Cross multiply
    138,000.10x = 207,000.15 × 131,439.10
  4. Step 4: Simplify right side
    138,000.10x = 27,207,913,415.87
  5. Step 5: Solve for x
    x = 27,207,913,415.87/138,000.10
  6. Step 6: Final answer
    x = 197,158.65

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1.5x scale

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.