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Finding the Fourth Proportional to 129,544.80, 178,768.80 and 72,956.40

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Solution

The fourth proportional to 129,544.80, 178,768.80 and 72,956.40 is: 100,678.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,544.80 : 178,768.80 = 72,956.40 : x
  2. Step 2: Convert to fraction form
    129,544.80/178,768.80 = 72,956.40/x
  3. Step 3: Cross multiply
    129,544.80x = 178,768.80 × 72,956.40
  4. Step 4: Simplify right side
    129,544.80x = 13,042,328,080.32
  5. Step 5: Solve for x
    x = 13,042,328,080.32/129,544.80
  6. Step 6: Final answer
    x = 100,678.13

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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.