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Finding the Fourth Proportional to 79,221.10, 109,314.70 and 47,378.38

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Solution

The fourth proportional to 79,221.10, 109,314.70 and 47,378.38 is: 65,375.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,221.10 : 109,314.70 = 47,378.38 : x
  2. Step 2: Convert to fraction form
    79,221.10/109,314.70 = 47,378.38/x
  3. Step 3: Cross multiply
    79,221.10x = 109,314.70 × 47,378.38
  4. Step 4: Simplify right side
    79,221.10x = 5,179,153,396.19
  5. Step 5: Solve for x
    x = 5,179,153,396.19/79,221.10
  6. Step 6: Final answer
    x = 65,375.93

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1.5x scale

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.