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Finding the Fourth Proportional to 154,147.20, 212,706 and 87,079.20

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Solution

The fourth proportional to 154,147.20, 212,706 and 87,079.20 is: 120,159.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    154,147.20 : 212,706 = 87,079.20 : x
  2. Step 2: Convert to fraction form
    154,147.20/212,706 = 87,079.20/x
  3. Step 3: Cross multiply
    154,147.20x = 212,706 × 87,079.20
  4. Step 4: Simplify right side
    154,147.20x = 18,522,268,315.20
  5. Step 5: Solve for x
    x = 18,522,268,315.20/154,147.20
  6. Step 6: Final answer
    x = 120,159.62

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.