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Finding the Fourth Proportional to 71,720.70, 107,482.62 and 45,378.29

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Solution

The fourth proportional to 71,720.70, 107,482.62 and 45,378.29 is: 68,005.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,720.70 : 107,482.62 = 45,378.29 : x
  2. Step 2: Convert to fraction form
    71,720.70/107,482.62 = 45,378.29/x
  3. Step 3: Cross multiply
    71,720.70x = 107,482.62 × 45,378.29
  4. Step 4: Simplify right side
    71,720.70x = 4,877,376,962.91
  5. Step 5: Solve for x
    x = 4,877,376,962.91/71,720.70
  6. Step 6: Final answer
    x = 68,005.15

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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.