Home / 21,372.12-29,498.58-12,987

Finding the Fourth Proportional to 21,372.12, 29,498.58 and 12,987

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Solution

The fourth proportional to 21,372.12, 29,498.58 and 12,987 is: 17,925.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,372.12 : 29,498.58 = 12,987 : x
  2. Step 2: Convert to fraction form
    21,372.12/29,498.58 = 12,987/x
  3. Step 3: Cross multiply
    21,372.12x = 29,498.58 × 12,987
  4. Step 4: Simplify right side
    21,372.12x = 383,098,058.46
  5. Step 5: Solve for x
    x = 383,098,058.46/21,372.12
  6. Step 6: Final answer
    x = 17,925.13

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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.