Home / 21,587.28-29,790-12,155.76

Finding the Fourth Proportional to 21,587.28, 29,790 and 12,155.76

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Solution

The fourth proportional to 21,587.28, 29,790 and 12,155.76 is: 16,774.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,587.28 : 29,790 = 12,155.76 : x
  2. Step 2: Convert to fraction form
    21,587.28/29,790 = 12,155.76/x
  3. Step 3: Cross multiply
    21,587.28x = 29,790 × 12,155.76
  4. Step 4: Simplify right side
    21,587.28x = 362,120,090.40
  5. Step 5: Solve for x
    x = 362,120,090.40/21,587.28
  6. Step 6: Final answer
    x = 16,774.70

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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.