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Finding the Fourth Proportional to 138,750.40, 208,125.60 and 128,908.90

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Solution

The fourth proportional to 138,750.40, 208,125.60 and 128,908.90 is: 193,363.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,750.40 : 208,125.60 = 128,908.90 : x
  2. Step 2: Convert to fraction form
    138,750.40/208,125.60 = 128,908.90/x
  3. Step 3: Cross multiply
    138,750.40x = 208,125.60 × 128,908.90
  4. Step 4: Simplify right side
    138,750.40x = 26,829,242,157.84
  5. Step 5: Solve for x
    x = 26,829,242,157.84/138,750.40
  6. Step 6: Final answer
    x = 193,363.35

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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.