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Finding the Fourth Proportional to 21,739.20, 32,560.20 and 21,253.20

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Solution

The fourth proportional to 21,739.20, 32,560.20 and 21,253.20 is: 31,832.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,739.20 : 32,560.20 = 21,253.20 : x
  2. Step 2: Convert to fraction form
    21,739.20/32,560.20 = 21,253.20/x
  3. Step 3: Cross multiply
    21,739.20x = 32,560.20 × 21,253.20
  4. Step 4: Simplify right side
    21,739.20x = 692,008,442.64
  5. Step 5: Solve for x
    x = 692,008,442.64/21,739.20
  6. Step 6: Final answer
    x = 31,832.29

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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.