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Finding the Fourth Proportional to 79,645.52, 109,905.12 and 47,378.36

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Solution

The fourth proportional to 79,645.52, 109,905.12 and 47,378.36 is: 65,378.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,645.52 : 109,905.12 = 47,378.36 : x
  2. Step 2: Convert to fraction form
    79,645.52/109,905.12 = 47,378.36/x
  3. Step 3: Cross multiply
    79,645.52x = 109,905.12 × 47,378.36
  4. Step 4: Simplify right side
    79,645.52x = 5,207,124,341.20
  5. Step 5: Solve for x
    x = 5,207,124,341.20/79,645.52
  6. Step 6: Final answer
    x = 65,378.75

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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.