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Finding the Fourth Proportional to 128,703.82, 177,612.46 and 71,343.76

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Solution

The fourth proportional to 128,703.82, 177,612.46 and 71,343.76 is: 98,455.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,703.82 : 177,612.46 = 71,343.76 : x
  2. Step 2: Convert to fraction form
    128,703.82/177,612.46 = 71,343.76/x
  3. Step 3: Cross multiply
    128,703.82x = 177,612.46 × 71,343.76
  4. Step 4: Simplify right side
    128,703.82x = 12,671,540,096.86
  5. Step 5: Solve for x
    x = 12,671,540,096.86/128,703.82
  6. Step 6: Final answer
    x = 98,455.04

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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.