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Finding the Fourth Proportional to 128,486.79, 177,309.62 and 71,124.90

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Solution

The fourth proportional to 128,486.79, 177,309.62 and 71,124.90 is: 98,151.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,486.79 : 177,309.62 = 71,124.90 : x
  2. Step 2: Convert to fraction form
    128,486.79/177,309.62 = 71,124.90/x
  3. Step 3: Cross multiply
    128,486.79x = 177,309.62 × 71,124.90
  4. Step 4: Simplify right side
    128,486.79x = 12,611,128,635.91
  5. Step 5: Solve for x
    x = 12,611,128,635.91/128,486.79
  6. Step 6: Final answer
    x = 98,151.17

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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.