Home / 138,740.10-208,101.61-85,442.24

Finding the Fourth Proportional to 138,740.10, 208,101.61 and 85,442.24

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Solution

The fourth proportional to 138,740.10, 208,101.61 and 85,442.24 is: 128,158.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,740.10 : 208,101.61 = 85,442.24 : x
  2. Step 2: Convert to fraction form
    138,740.10/208,101.61 = 85,442.24/x
  3. Step 3: Cross multiply
    138,740.10x = 208,101.61 × 85,442.24
  4. Step 4: Simplify right side
    138,740.10x = 17,780,666,238.29
  5. Step 5: Solve for x
    x = 17,780,666,238.29/138,740.10
  6. Step 6: Final answer
    x = 128,158.09

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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.