Home / 20,981.24-28,956.16-15,666.84

Finding the Fourth Proportional to 20,981.24, 28,956.16 and 15,666.84

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Solution

The fourth proportional to 20,981.24, 28,956.16 and 15,666.84 is: 21,621.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,981.24 : 28,956.16 = 15,666.84 : x
  2. Step 2: Convert to fraction form
    20,981.24/28,956.16 = 15,666.84/x
  3. Step 3: Cross multiply
    20,981.24x = 28,956.16 × 15,666.84
  4. Step 4: Simplify right side
    20,981.24x = 453,651,525.73
  5. Step 5: Solve for x
    x = 453,651,525.73/20,981.24
  6. Step 6: Final answer
    x = 21,621.77

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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.