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Finding the Fourth Proportional to 28,956.80, 39,966.54 and 22,168.88

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Solution

The fourth proportional to 28,956.80, 39,966.54 and 22,168.88 is: 30,597.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,956.80 : 39,966.54 = 22,168.88 : x
  2. Step 2: Convert to fraction form
    28,956.80/39,966.54 = 22,168.88/x
  3. Step 3: Cross multiply
    28,956.80x = 39,966.54 × 22,168.88
  4. Step 4: Simplify right side
    28,956.80x = 886,013,429.28
  5. Step 5: Solve for x
    x = 886,013,429.28/28,956.80
  6. Step 6: Final answer
    x = 30,597.77

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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.