Home / 138,966.10-208,643.55-86,478.10

Finding the Fourth Proportional to 138,966.10, 208,643.55 and 86,478.10

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Solution

The fourth proportional to 138,966.10, 208,643.55 and 86,478.10 is: 129,838.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,966.10 : 208,643.55 = 86,478.10 : x
  2. Step 2: Convert to fraction form
    138,966.10/208,643.55 = 86,478.10/x
  3. Step 3: Cross multiply
    138,966.10x = 208,643.55 × 86,478.10
  4. Step 4: Simplify right side
    138,966.10x = 18,043,097,781.26
  5. Step 5: Solve for x
    x = 18,043,097,781.26/138,966.10
  6. Step 6: Final answer
    x = 129,838.12

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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.