Home / 138,723.84-208,084.32-72,129.60

Finding the Fourth Proportional to 138,723.84, 208,084.32 and 72,129.60

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Solution

The fourth proportional to 138,723.84, 208,084.32 and 72,129.60 is: 108,193.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,723.84 : 208,084.32 = 72,129.60 : x
  2. Step 2: Convert to fraction form
    138,723.84/208,084.32 = 72,129.60/x
  3. Step 3: Cross multiply
    138,723.84x = 208,084.32 × 72,129.60
  4. Step 4: Simplify right side
    138,723.84x = 15,009,038,767.87
  5. Step 5: Solve for x
    x = 15,009,038,767.87/138,723.84
  6. Step 6: Final answer
    x = 108,193.65

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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.