Home / 21,981.87-30,332.55-12,420.74

Finding the Fourth Proportional to 21,981.87, 30,332.55 and 12,420.74

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Solution

The fourth proportional to 21,981.87, 30,332.55 and 12,420.74 is: 17,139.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,981.87 : 30,332.55 = 12,420.74 : x
  2. Step 2: Convert to fraction form
    21,981.87/30,332.55 = 12,420.74/x
  3. Step 3: Cross multiply
    21,981.87x = 30,332.55 × 12,420.74
  4. Step 4: Simplify right side
    21,981.87x = 376,752,565.42
  5. Step 5: Solve for x
    x = 376,752,565.42/21,981.87
  6. Step 6: Final answer
    x = 17,139.24

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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.