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Finding the Fourth Proportional to 71,345.80, 107,018.70 and 66,680.20

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Solution

The fourth proportional to 71,345.80, 107,018.70 and 66,680.20 is: 100,020.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,345.80 : 107,018.70 = 66,680.20 : x
  2. Step 2: Convert to fraction form
    71,345.80/107,018.70 = 66,680.20/x
  3. Step 3: Cross multiply
    71,345.80x = 107,018.70 × 66,680.20
  4. Step 4: Simplify right side
    71,345.80x = 7,136,028,319.74
  5. Step 5: Solve for x
    x = 7,136,028,319.74/71,345.80
  6. Step 6: Final answer
    x = 100,020.30

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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.