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Finding the Fourth Proportional to 261,007.80, 391,511.70 and 121,039.80

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Solution

The fourth proportional to 261,007.80, 391,511.70 and 121,039.80 is: 181,559.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,007.80 : 391,511.70 = 121,039.80 : x
  2. Step 2: Convert to fraction form
    261,007.80/391,511.70 = 121,039.80/x
  3. Step 3: Cross multiply
    261,007.80x = 391,511.70 × 121,039.80
  4. Step 4: Simplify right side
    261,007.80x = 47,388,497,865.66
  5. Step 5: Solve for x
    x = 47,388,497,865.66/261,007.80
  6. Step 6: Final answer
    x = 181,559.70

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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.