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Finding the Fourth Proportional to 81,423.30, 122,147.10 and 28,828.65

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Solution

The fourth proportional to 81,423.30, 122,147.10 and 28,828.65 is: 43,247.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,423.30 : 122,147.10 = 28,828.65 : x
  2. Step 2: Convert to fraction form
    81,423.30/122,147.10 = 28,828.65/x
  3. Step 3: Cross multiply
    81,423.30x = 122,147.10 × 28,828.65
  4. Step 4: Simplify right side
    81,423.30x = 3,521,335,994.42
  5. Step 5: Solve for x
    x = 3,521,335,994.42/81,423.30
  6. Step 6: Final answer
    x = 43,247.28

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1.5x scale

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.