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Finding the Fourth Proportional to 139,045.08, 191,874.51 and 78,611.88

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Solution

The fourth proportional to 139,045.08, 191,874.51 and 78,611.88 is: 108,480.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,045.08 : 191,874.51 = 78,611.88 : x
  2. Step 2: Convert to fraction form
    139,045.08/191,874.51 = 78,611.88/x
  3. Step 3: Cross multiply
    139,045.08x = 191,874.51 × 78,611.88
  4. Step 4: Simplify right side
    139,045.08x = 15,083,615,955.18
  5. Step 5: Solve for x
    x = 15,083,615,955.18/139,045.08
  6. Step 6: Final answer
    x = 108,480.04

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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.