Home / 138,681.12-208,018.80-88,785.12

Finding the Fourth Proportional to 138,681.12, 208,018.80 and 88,785.12

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Solution

The fourth proportional to 138,681.12, 208,018.80 and 88,785.12 is: 133,175.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,681.12 : 208,018.80 = 88,785.12 : x
  2. Step 2: Convert to fraction form
    138,681.12/208,018.80 = 88,785.12/x
  3. Step 3: Cross multiply
    138,681.12x = 208,018.80 × 88,785.12
  4. Step 4: Simplify right side
    138,681.12x = 18,468,974,120.26
  5. Step 5: Solve for x
    x = 18,468,974,120.26/138,681.12
  6. Step 6: Final answer
    x = 133,175.84

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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.