Home / 138,009.30-207,135.45-81,779.10

Finding the Fourth Proportional to 138,009.30, 207,135.45 and 81,779.10

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Solution

The fourth proportional to 138,009.30, 207,135.45 and 81,779.10 is: 122,740.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,009.30 : 207,135.45 = 81,779.10 : x
  2. Step 2: Convert to fraction form
    138,009.30/207,135.45 = 81,779.10/x
  3. Step 3: Cross multiply
    138,009.30x = 207,135.45 × 81,779.10
  4. Step 4: Simplify right side
    138,009.30x = 16,939,350,679.10
  5. Step 5: Solve for x
    x = 16,939,350,679.10/138,009.30
  6. Step 6: Final answer
    x = 122,740.65

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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.