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Finding the Fourth Proportional to 66,423.80, 91,478.22 and 64,972.28

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Solution

The fourth proportional to 66,423.80, 91,478.22 and 64,972.28 is: 89,479.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,423.80 : 91,478.22 = 64,972.28 : x
  2. Step 2: Convert to fraction form
    66,423.80/91,478.22 = 64,972.28/x
  3. Step 3: Cross multiply
    66,423.80x = 91,478.22 × 64,972.28
  4. Step 4: Simplify right side
    66,423.80x = 5,943,548,523.74
  5. Step 5: Solve for x
    x = 5,943,548,523.74/66,423.80
  6. Step 6: Final answer
    x = 89,479.20

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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.