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Finding the Fourth Proportional to 261,379.30, 391,911.10 and 117,258.74

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Solution

The fourth proportional to 261,379.30, 391,911.10 and 117,258.74 is: 175,817.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,379.30 : 391,911.10 = 117,258.74 : x
  2. Step 2: Convert to fraction form
    261,379.30/391,911.10 = 117,258.74/x
  3. Step 3: Cross multiply
    261,379.30x = 391,911.10 × 117,258.74
  4. Step 4: Simplify right side
    261,379.30x = 45,955,001,778.01
  5. Step 5: Solve for x
    x = 45,955,001,778.01/261,379.30
  6. Step 6: Final answer
    x = 175,817.30

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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.