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Finding the Fourth Proportional to 145,105.80, 217,658.70 and 128,776.20

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Solution

The fourth proportional to 145,105.80, 217,658.70 and 128,776.20 is: 193,164.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    145,105.80 : 217,658.70 = 128,776.20 : x
  2. Step 2: Convert to fraction form
    145,105.80/217,658.70 = 128,776.20/x
  3. Step 3: Cross multiply
    145,105.80x = 217,658.70 × 128,776.20
  4. Step 4: Simplify right side
    145,105.80x = 28,029,260,282.94
  5. Step 5: Solve for x
    x = 28,029,260,282.94/145,105.80
  6. Step 6: Final answer
    x = 193,164.30

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.