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Finding the Fourth Proportional to 66,470.48, 99,720.12 and 19,722

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Solution

The fourth proportional to 66,470.48, 99,720.12 and 19,722 is: 29,587.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,470.48 : 99,720.12 = 19,722 : x
  2. Step 2: Convert to fraction form
    66,470.48/99,720.12 = 19,722/x
  3. Step 3: Cross multiply
    66,470.48x = 99,720.12 × 19,722
  4. Step 4: Simplify right side
    66,470.48x = 1,966,680,206.64
  5. Step 5: Solve for x
    x = 1,966,680,206.64/66,470.48
  6. Step 6: Final answer
    x = 29,587.27

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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.