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Finding the Fourth Proportional to 66,885.76, 92,289.36 and 39,656.82

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Solution

The fourth proportional to 66,885.76, 92,289.36 and 39,656.82 is: 54,718.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,885.76 : 92,289.36 = 39,656.82 : x
  2. Step 2: Convert to fraction form
    66,885.76/92,289.36 = 39,656.82/x
  3. Step 3: Cross multiply
    66,885.76x = 92,289.36 × 39,656.82
  4. Step 4: Simplify right side
    66,885.76x = 3,659,902,124.20
  5. Step 5: Solve for x
    x = 3,659,902,124.20/66,885.76
  6. Step 6: Final answer
    x = 54,718.70

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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.