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Finding the Fourth Proportional to 128,997.49, 178,011.39 and 71,639.77

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Solution

The fourth proportional to 128,997.49, 178,011.39 and 71,639.77 is: 98,860.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,997.49 : 178,011.39 = 71,639.77 : x
  2. Step 2: Convert to fraction form
    128,997.49/178,011.39 = 71,639.77/x
  3. Step 3: Cross multiply
    128,997.49x = 178,011.39 × 71,639.77
  4. Step 4: Simplify right side
    128,997.49x = 12,752,695,036.98
  5. Step 5: Solve for x
    x = 12,752,695,036.98/128,997.49
  6. Step 6: Final answer
    x = 98,860.02

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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.