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Finding the Fourth Proportional to 66,257.80, 99,386.70 and 21,891.40

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Solution

The fourth proportional to 66,257.80, 99,386.70 and 21,891.40 is: 32,837.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,257.80 : 99,386.70 = 21,891.40 : x
  2. Step 2: Convert to fraction form
    66,257.80/99,386.70 = 21,891.40/x
  3. Step 3: Cross multiply
    66,257.80x = 99,386.70 × 21,891.40
  4. Step 4: Simplify right side
    66,257.80x = 2,175,714,004.38
  5. Step 5: Solve for x
    x = 2,175,714,004.38/66,257.80
  6. Step 6: Final answer
    x = 32,837.10

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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.