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Finding the Fourth Proportional to 43,689.60, 65,404.80 and 28,915.20

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Solution

The fourth proportional to 43,689.60, 65,404.80 and 28,915.20 is: 43,287.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    43,689.60 : 65,404.80 = 28,915.20 : x
  2. Step 2: Convert to fraction form
    43,689.60/65,404.80 = 28,915.20/x
  3. Step 3: Cross multiply
    43,689.60x = 65,404.80 × 28,915.20
  4. Step 4: Simplify right side
    43,689.60x = 1,891,192,872.96
  5. Step 5: Solve for x
    x = 1,891,192,872.96/43,689.60
  6. Step 6: Final answer
    x = 43,287.03

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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.