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Finding the Fourth Proportional to 385,170.78, 531,532.59 and 215,404.91

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Solution

The fourth proportional to 385,170.78, 531,532.59 and 215,404.91 is: 297,257.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    385,170.78 : 531,532.59 = 215,404.91 : x
  2. Step 2: Convert to fraction form
    385,170.78/531,532.59 = 215,404.91/x
  3. Step 3: Cross multiply
    385,170.78x = 531,532.59 × 215,404.91
  4. Step 4: Simplify right side
    385,170.78x = 114,494,729,711.02
  5. Step 5: Solve for x
    x = 114,494,729,711.02/385,170.78
  6. Step 6: Final answer
    x = 297,257.05

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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.