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Finding the Fourth Proportional to 83,108.65, 124,662.96 and 20,779.15

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Solution

The fourth proportional to 83,108.65, 124,662.96 and 20,779.15 is: 31,168.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    83,108.65 : 124,662.96 = 20,779.15 : x
  2. Step 2: Convert to fraction form
    83,108.65/124,662.96 = 20,779.15/x
  3. Step 3: Cross multiply
    83,108.65x = 124,662.96 × 20,779.15
  4. Step 4: Simplify right side
    83,108.65x = 2,590,390,085.57
  5. Step 5: Solve for x
    x = 2,590,390,085.57/83,108.65
  6. Step 6: Final answer
    x = 31,168.72

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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.