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Finding the Fourth Proportional to 138,000.60, 207,000.90 and 100,384.20

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Solution

The fourth proportional to 138,000.60, 207,000.90 and 100,384.20 is: 150,576.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,000.60 : 207,000.90 = 100,384.20 : x
  2. Step 2: Convert to fraction form
    138,000.60/207,000.90 = 100,384.20/x
  3. Step 3: Cross multiply
    138,000.60x = 207,000.90 × 100,384.20
  4. Step 4: Simplify right side
    138,000.60x = 20,779,619,745.78
  5. Step 5: Solve for x
    x = 20,779,619,745.78/138,000.60
  6. Step 6: Final answer
    x = 150,576.30

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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.