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Finding the Fourth Proportional to 21,690.80, 32,464.20 and 15,750.80

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Solution

The fourth proportional to 21,690.80, 32,464.20 and 15,750.80 is: 23,573.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,690.80 : 32,464.20 = 15,750.80 : x
  2. Step 2: Convert to fraction form
    21,690.80/32,464.20 = 15,750.80/x
  3. Step 3: Cross multiply
    21,690.80x = 32,464.20 × 15,750.80
  4. Step 4: Simplify right side
    21,690.80x = 511,337,121.36
  5. Step 5: Solve for x
    x = 511,337,121.36/21,690.80
  6. Step 6: Final answer
    x = 23,573.92

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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.