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Finding the Fourth Proportional to 261,075.40, 391,613.10 and 121,107.40

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Solution

The fourth proportional to 261,075.40, 391,613.10 and 121,107.40 is: 181,661.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,075.40 : 391,613.10 = 121,107.40 : x
  2. Step 2: Convert to fraction form
    261,075.40/391,613.10 = 121,107.40/x
  3. Step 3: Cross multiply
    261,075.40x = 391,613.10 × 121,107.40
  4. Step 4: Simplify right side
    261,075.40x = 47,427,244,346.94
  5. Step 5: Solve for x
    x = 47,427,244,346.94/261,075.40
  6. Step 6: Final answer
    x = 181,661.10

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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.