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Finding the Fourth Proportional to 138,925.40, 208,080.90 and 83,629.40

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Solution

The fourth proportional to 138,925.40, 208,080.90 and 83,629.40 is: 125,259.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,925.40 : 208,080.90 = 83,629.40 : x
  2. Step 2: Convert to fraction form
    138,925.40/208,080.90 = 83,629.40/x
  3. Step 3: Cross multiply
    138,925.40x = 208,080.90 × 83,629.40
  4. Step 4: Simplify right side
    138,925.40x = 17,401,680,818.46
  5. Step 5: Solve for x
    x = 17,401,680,818.46/138,925.40
  6. Step 6: Final answer
    x = 125,259.17

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1.5x scale

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.