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Finding the Fourth Proportional to 128,011.61, 191,957.97 and 74,718.97

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Solution

The fourth proportional to 128,011.61, 191,957.97 and 74,718.97 is: 112,043.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,011.61 : 191,957.97 = 74,718.97 : x
  2. Step 2: Convert to fraction form
    128,011.61/191,957.97 = 74,718.97/x
  3. Step 3: Cross multiply
    128,011.61x = 191,957.97 × 74,718.97
  4. Step 4: Simplify right side
    128,011.61x = 14,342,901,801.69
  5. Step 5: Solve for x
    x = 14,342,901,801.69/128,011.61
  6. Step 6: Final answer
    x = 112,043.76

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.