Home / 21,218.28-29,281.78-11,787.72

Finding the Fourth Proportional to 21,218.28, 29,281.78 and 11,787.72

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Solution

The fourth proportional to 21,218.28, 29,281.78 and 11,787.72 is: 16,267.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,218.28 : 29,281.78 = 11,787.72 : x
  2. Step 2: Convert to fraction form
    21,218.28/29,281.78 = 11,787.72/x
  3. Step 3: Cross multiply
    21,218.28x = 29,281.78 × 11,787.72
  4. Step 4: Simplify right side
    21,218.28x = 345,165,423.74
  5. Step 5: Solve for x
    x = 345,165,423.74/21,218.28
  6. Step 6: Final answer
    x = 16,267.36

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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.