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Finding the Fourth Proportional to 261,486.70, 391,885.39 and 103,629.02

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Solution

The fourth proportional to 261,486.70, 391,885.39 and 103,629.02 is: 155,306.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,486.70 : 391,885.39 = 103,629.02 : x
  2. Step 2: Convert to fraction form
    261,486.70/391,885.39 = 103,629.02/x
  3. Step 3: Cross multiply
    261,486.70x = 391,885.39 × 103,629.02
  4. Step 4: Simplify right side
    261,486.70x = 40,610,698,918.02
  5. Step 5: Solve for x
    x = 40,610,698,918.02/261,486.70
  6. Step 6: Final answer
    x = 155,306.94

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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.