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Finding the Fourth Proportional to 66,611.60, 99,966.72 and 31,551.36

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Solution

The fourth proportional to 66,611.60, 99,966.72 and 31,551.36 is: 47,350.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,611.60 : 99,966.72 = 31,551.36 : x
  2. Step 2: Convert to fraction form
    66,611.60/99,966.72 = 31,551.36/x
  3. Step 3: Cross multiply
    66,611.60x = 99,966.72 × 31,551.36
  4. Step 4: Simplify right side
    66,611.60x = 3,154,085,970.74
  5. Step 5: Solve for x
    x = 3,154,085,970.74/66,611.60
  6. Step 6: Final answer
    x = 47,350.40

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.