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Finding the Fourth Proportional to 79,478.80, 109,690.28 and 47,665.20

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Solution

The fourth proportional to 79,478.80, 109,690.28 and 47,665.20 is: 65,783.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,478.80 : 109,690.28 = 47,665.20 : x
  2. Step 2: Convert to fraction form
    79,478.80/109,690.28 = 47,665.20/x
  3. Step 3: Cross multiply
    79,478.80x = 109,690.28 × 47,665.20
  4. Step 4: Simplify right side
    79,478.80x = 5,228,409,134.26
  5. Step 5: Solve for x
    x = 5,228,409,134.26/79,478.80
  6. Step 6: Final answer
    x = 65,783.69

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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.