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Finding the Fourth Proportional to 261,003.70, 391,505.55 and 208,515.70

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Solution

The fourth proportional to 261,003.70, 391,505.55 and 208,515.70 is: 312,773.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,003.70 : 391,505.55 = 208,515.70 : x
  2. Step 2: Convert to fraction form
    261,003.70/391,505.55 = 208,515.70/x
  3. Step 3: Cross multiply
    261,003.70x = 391,505.55 × 208,515.70
  4. Step 4: Simplify right side
    261,003.70x = 81,635,053,812.14
  5. Step 5: Solve for x
    x = 81,635,053,812.14/261,003.70
  6. Step 6: Final answer
    x = 312,773.55

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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.