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Finding the Fourth Proportional to 128,937.84, 177,937.26 and 72,353.40

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Solution

The fourth proportional to 128,937.84, 177,937.26 and 72,353.40 is: 99,849.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,937.84 : 177,937.26 = 72,353.40 : x
  2. Step 2: Convert to fraction form
    128,937.84/177,937.26 = 72,353.40/x
  3. Step 3: Cross multiply
    128,937.84x = 177,937.26 × 72,353.40
  4. Step 4: Simplify right side
    128,937.84x = 12,874,365,747.68
  5. Step 5: Solve for x
    x = 12,874,365,747.68/128,937.84
  6. Step 6: Final answer
    x = 99,849.40

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.