Home / 138,740.23-208,101.80-85,442.36

Finding the Fourth Proportional to 138,740.23, 208,101.80 and 85,442.36

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Solution

The fourth proportional to 138,740.23, 208,101.80 and 85,442.36 is: 128,158.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,740.23 : 208,101.80 = 85,442.36 : x
  2. Step 2: Convert to fraction form
    138,740.23/208,101.80 = 85,442.36/x
  3. Step 3: Cross multiply
    138,740.23x = 208,101.80 × 85,442.36
  4. Step 4: Simplify right side
    138,740.23x = 17,780,708,485.04
  5. Step 5: Solve for x
    x = 17,780,708,485.04/138,740.23
  6. Step 6: Final answer
    x = 128,158.28

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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.