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Finding the Fourth Proportional to 128,902.32, 177,892.20 and 72,312.48

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Solution

The fourth proportional to 128,902.32, 177,892.20 and 72,312.48 is: 99,795.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,902.32 : 177,892.20 = 72,312.48 : x
  2. Step 2: Convert to fraction form
    128,902.32/177,892.20 = 72,312.48/x
  3. Step 3: Cross multiply
    128,902.32x = 177,892.20 × 72,312.48
  4. Step 4: Simplify right side
    128,902.32x = 12,863,826,154.66
  5. Step 5: Solve for x
    x = 12,863,826,154.66/128,902.32
  6. Step 6: Final answer
    x = 99,795.15

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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.