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Finding the Fourth Proportional to 139,006.95, 191,827.51 and 78,575.47

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Solution

The fourth proportional to 139,006.95, 191,827.51 and 78,575.47 is: 108,432.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,006.95 : 191,827.51 = 78,575.47 : x
  2. Step 2: Convert to fraction form
    139,006.95/191,827.51 = 78,575.47/x
  3. Step 3: Cross multiply
    139,006.95x = 191,827.51 × 78,575.47
  4. Step 4: Simplify right side
    139,006.95x = 15,072,936,081.17
  5. Step 5: Solve for x
    x = 15,072,936,081.17/139,006.95
  6. Step 6: Final answer
    x = 108,432.97

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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.