Home / 21,138.62-31,710.36-12,373.62

Finding the Fourth Proportional to 21,138.62, 31,710.36 and 12,373.62

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Solution

The fourth proportional to 21,138.62, 31,710.36 and 12,373.62 is: 18,561.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,138.62 : 31,710.36 = 12,373.62 : x
  2. Step 2: Convert to fraction form
    21,138.62/31,710.36 = 12,373.62/x
  3. Step 3: Cross multiply
    21,138.62x = 31,710.36 × 12,373.62
  4. Step 4: Simplify right side
    21,138.62x = 392,371,944.70
  5. Step 5: Solve for x
    x = 392,371,944.70/21,138.62
  6. Step 6: Final answer
    x = 18,561.85

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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.