Home / 21,981.52-30,326.92-12,420.28

Finding the Fourth Proportional to 21,981.52, 30,326.92 and 12,420.28

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Solution

The fourth proportional to 21,981.52, 30,326.92 and 12,420.28 is: 17,135.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,981.52 : 30,326.92 = 12,420.28 : x
  2. Step 2: Convert to fraction form
    21,981.52/30,326.92 = 12,420.28/x
  3. Step 3: Cross multiply
    21,981.52x = 30,326.92 × 12,420.28
  4. Step 4: Simplify right side
    21,981.52x = 376,668,837.94
  5. Step 5: Solve for x
    x = 376,668,837.94/21,981.52
  6. Step 6: Final answer
    x = 17,135.70

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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.