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Finding the Fourth Proportional to 79,221.60, 109,315.40 and 47,378.88

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Solution

The fourth proportional to 79,221.60, 109,315.40 and 47,378.88 is: 65,376.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,221.60 : 109,315.40 = 47,378.88 : x
  2. Step 2: Convert to fraction form
    79,221.60/109,315.40 = 47,378.88/x
  3. Step 3: Cross multiply
    79,221.60x = 109,315.40 × 47,378.88
  4. Step 4: Simplify right side
    79,221.60x = 5,179,240,981.86
  5. Step 5: Solve for x
    x = 5,179,240,981.86/79,221.60
  6. Step 6: Final answer
    x = 65,376.63

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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.