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Finding the Fourth Proportional to 21,978.20, 32,963.92 and 7,187.20

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Solution

The fourth proportional to 21,978.20, 32,963.92 and 7,187.20 is: 10,779.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,978.20 : 32,963.92 = 7,187.20 : x
  2. Step 2: Convert to fraction form
    21,978.20/32,963.92 = 7,187.20/x
  3. Step 3: Cross multiply
    21,978.20x = 32,963.92 × 7,187.20
  4. Step 4: Simplify right side
    21,978.20x = 236,918,285.82
  5. Step 5: Solve for x
    x = 236,918,285.82/21,978.20
  6. Step 6: Final answer
    x = 10,779.69

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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.