Home / 21,279.72-31,908.90-12,397.92

Finding the Fourth Proportional to 21,279.72, 31,908.90 and 12,397.92

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Solution

The fourth proportional to 21,279.72, 31,908.90 and 12,397.92 is: 18,590.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,279.72 : 31,908.90 = 12,397.92 : x
  2. Step 2: Convert to fraction form
    21,279.72/31,908.90 = 12,397.92/x
  3. Step 3: Cross multiply
    21,279.72x = 31,908.90 × 12,397.92
  4. Step 4: Simplify right side
    21,279.72x = 395,603,989.49
  5. Step 5: Solve for x
    x = 395,603,989.49/21,279.72
  6. Step 6: Final answer
    x = 18,590.66

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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.