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Finding the Fourth Proportional to 138,479.69, 191,102.07 and 74,817.47

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Solution

The fourth proportional to 138,479.69, 191,102.07 and 74,817.47 is: 103,248.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,479.69 : 191,102.07 = 74,817.47 : x
  2. Step 2: Convert to fraction form
    138,479.69/191,102.07 = 74,817.47/x
  3. Step 3: Cross multiply
    138,479.69x = 191,102.07 × 74,817.47
  4. Step 4: Simplify right side
    138,479.69x = 14,297,772,433.65
  5. Step 5: Solve for x
    x = 14,297,772,433.65/138,479.69
  6. Step 6: Final answer
    x = 103,248.16

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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.