Home / 21,981.66-30,337.35-12,421.95

Finding the Fourth Proportional to 21,981.66, 30,337.35 and 12,421.95

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Solution

The fourth proportional to 21,981.66, 30,337.35 and 12,421.95 is: 17,143.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,981.66 : 30,337.35 = 12,421.95 : x
  2. Step 2: Convert to fraction form
    21,981.66/30,337.35 = 12,421.95/x
  3. Step 3: Cross multiply
    21,981.66x = 30,337.35 × 12,421.95
  4. Step 4: Simplify right side
    21,981.66x = 376,849,044.83
  5. Step 5: Solve for x
    x = 376,849,044.83/21,981.66
  6. Step 6: Final answer
    x = 17,143.79

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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.