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Finding the Fourth Proportional to 21,348.60, 32,061.30 and 20,657.40

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Solution

The fourth proportional to 21,348.60, 32,061.30 and 20,657.40 is: 31,023.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,348.60 : 32,061.30 = 20,657.40 : x
  2. Step 2: Convert to fraction form
    21,348.60/32,061.30 = 20,657.40/x
  3. Step 3: Cross multiply
    21,348.60x = 32,061.30 × 20,657.40
  4. Step 4: Simplify right side
    21,348.60x = 662,303,098.62
  5. Step 5: Solve for x
    x = 662,303,098.62/21,348.60
  6. Step 6: Final answer
    x = 31,023.26

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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.