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Finding the Fourth Proportional to 138,641.67, 191,325.51 and 74,979.45

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Solution

The fourth proportional to 138,641.67, 191,325.51 and 74,979.45 is: 103,471.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,641.67 : 191,325.51 = 74,979.45 : x
  2. Step 2: Convert to fraction form
    138,641.67/191,325.51 = 74,979.45/x
  3. Step 3: Cross multiply
    138,641.67x = 191,325.51 × 74,979.45
  4. Step 4: Simplify right side
    138,641.67x = 14,345,481,510.77
  5. Step 5: Solve for x
    x = 14,345,481,510.77/138,641.67
  6. Step 6: Final answer
    x = 103,471.64

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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.