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Finding the Fourth Proportional to 20,705.40, 31,079.70 and 11,957.40

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Solution

The fourth proportional to 20,705.40, 31,079.70 and 11,957.40 is: 17,948.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,705.40 : 31,079.70 = 11,957.40 : x
  2. Step 2: Convert to fraction form
    20,705.40/31,079.70 = 11,957.40/x
  3. Step 3: Cross multiply
    20,705.40x = 31,079.70 × 11,957.40
  4. Step 4: Simplify right side
    20,705.40x = 371,632,404.78
  5. Step 5: Solve for x
    x = 371,632,404.78/20,705.40
  6. Step 6: Final answer
    x = 17,948.57

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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.