Home / 138,869.20-208,303.80-85,725.10

Finding the Fourth Proportional to 138,869.20, 208,303.80 and 85,725.10

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Solution

The fourth proportional to 138,869.20, 208,303.80 and 85,725.10 is: 128,587.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,869.20 : 208,303.80 = 85,725.10 : x
  2. Step 2: Convert to fraction form
    138,869.20/208,303.80 = 85,725.10/x
  3. Step 3: Cross multiply
    138,869.20x = 208,303.80 × 85,725.10
  4. Step 4: Simplify right side
    138,869.20x = 17,856,864,085.38
  5. Step 5: Solve for x
    x = 17,856,864,085.38/138,869.20
  6. Step 6: Final answer
    x = 128,587.65

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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.