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Finding the Fourth Proportional to 64,680.80, 89,211.39 and 57,113.78

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Solution

The fourth proportional to 64,680.80, 89,211.39 and 57,113.78 is: 78,774.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    64,680.80 : 89,211.39 = 57,113.78 : x
  2. Step 2: Convert to fraction form
    64,680.80/89,211.39 = 57,113.78/x
  3. Step 3: Cross multiply
    64,680.80x = 89,211.39 × 57,113.78
  4. Step 4: Simplify right side
    64,680.80x = 5,095,199,701.95
  5. Step 5: Solve for x
    x = 5,095,199,701.95/64,680.80
  6. Step 6: Final answer
    x = 78,774.53

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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.