Home / 21,587.20-29,788.20-12,155.56

Finding the Fourth Proportional to 21,587.20, 29,788.20 and 12,155.56

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Solution

The fourth proportional to 21,587.20, 29,788.20 and 12,155.56 is: 16,773.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,587.20 : 29,788.20 = 12,155.56 : x
  2. Step 2: Convert to fraction form
    21,587.20/29,788.20 = 12,155.56/x
  3. Step 3: Cross multiply
    21,587.20x = 29,788.20 × 12,155.56
  4. Step 4: Simplify right side
    21,587.20x = 362,092,252.39
  5. Step 5: Solve for x
    x = 362,092,252.39/21,587.20
  6. Step 6: Final answer
    x = 16,773.47

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.