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Finding the Fourth Proportional to 66,470.72, 99,706.70 and 19,723.60

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Solution

The fourth proportional to 66,470.72, 99,706.70 and 19,723.60 is: 29,585.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,470.72 : 99,706.70 = 19,723.60 : x
  2. Step 2: Convert to fraction form
    66,470.72/99,706.70 = 19,723.60/x
  3. Step 3: Cross multiply
    66,470.72x = 99,706.70 × 19,723.60
  4. Step 4: Simplify right side
    66,470.72x = 1,966,575,068.12
  5. Step 5: Solve for x
    x = 1,966,575,068.12/66,470.72
  6. Step 6: Final answer
    x = 29,585.58

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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.