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Finding the Fourth Proportional to 21,902.60, 32,892.30 and 21,211.40

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Solution

The fourth proportional to 21,902.60, 32,892.30 and 21,211.40 is: 31,854.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,902.60 : 32,892.30 = 21,211.40 : x
  2. Step 2: Convert to fraction form
    21,902.60/32,892.30 = 21,211.40/x
  3. Step 3: Cross multiply
    21,902.60x = 32,892.30 × 21,211.40
  4. Step 4: Simplify right side
    21,902.60x = 697,691,732.22
  5. Step 5: Solve for x
    x = 697,691,732.22/21,902.60
  6. Step 6: Final answer
    x = 31,854.29

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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.