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Finding the Fourth Proportional to 21,333.80, 32,015.10 and 13,920.20

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Solution

The fourth proportional to 21,333.80, 32,015.10 and 13,920.20 is: 20,889.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,333.80 : 32,015.10 = 13,920.20 : x
  2. Step 2: Convert to fraction form
    21,333.80/32,015.10 = 13,920.20/x
  3. Step 3: Cross multiply
    21,333.80x = 32,015.10 × 13,920.20
  4. Step 4: Simplify right side
    21,333.80x = 445,656,595.02
  5. Step 5: Solve for x
    x = 445,656,595.02/21,333.80
  6. Step 6: Final answer
    x = 20,889.70

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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.