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Finding the Fourth Proportional to 261,118.69, 391,700.81 and 74,130.19

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Solution

The fourth proportional to 261,118.69, 391,700.81 and 74,130.19 is: 111,201.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,118.69 : 391,700.81 = 74,130.19 : x
  2. Step 2: Convert to fraction form
    261,118.69/391,700.81 = 74,130.19/x
  3. Step 3: Cross multiply
    261,118.69x = 391,700.81 × 74,130.19
  4. Step 4: Simplify right side
    261,118.69x = 29,036,854,674.53
  5. Step 5: Solve for x
    x = 29,036,854,674.53/261,118.69
  6. Step 6: Final answer
    x = 111,201.75

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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.