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Finding the Fourth Proportional to 138,472.16, 191,091.64 and 74,809.84

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Solution

The fourth proportional to 138,472.16, 191,091.64 and 74,809.84 is: 103,237.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,472.16 : 191,091.64 = 74,809.84 : x
  2. Step 2: Convert to fraction form
    138,472.16/191,091.64 = 74,809.84/x
  3. Step 3: Cross multiply
    138,472.16x = 191,091.64 × 74,809.84
  4. Step 4: Simplify right side
    138,472.16x = 14,295,535,013.74
  5. Step 5: Solve for x
    x = 14,295,535,013.74/138,472.16
  6. Step 6: Final answer
    x = 103,237.61

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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.