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Finding the Fourth Proportional to 79,114.38, 109,180.85 and 45,128.40

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Solution

The fourth proportional to 79,114.38, 109,180.85 and 45,128.40 is: 62,278.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,114.38 : 109,180.85 = 45,128.40 : x
  2. Step 2: Convert to fraction form
    79,114.38/109,180.85 = 45,128.40/x
  3. Step 3: Cross multiply
    79,114.38x = 109,180.85 × 45,128.40
  4. Step 4: Simplify right side
    79,114.38x = 4,927,157,071.14
  5. Step 5: Solve for x
    x = 4,927,157,071.14/79,114.38
  6. Step 6: Final answer
    x = 62,278.91

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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.