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Finding the Fourth Proportional to 261,015.60, 391,231.80 and 111,230.40

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Solution

The fourth proportional to 261,015.60, 391,231.80 and 111,230.40 is: 166,721.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,015.60 : 391,231.80 = 111,230.40 : x
  2. Step 2: Convert to fraction form
    261,015.60/391,231.80 = 111,230.40/x
  3. Step 3: Cross multiply
    261,015.60x = 391,231.80 × 111,230.40
  4. Step 4: Simplify right side
    261,015.60x = 43,516,869,606.72
  5. Step 5: Solve for x
    x = 43,516,869,606.72/261,015.60
  6. Step 6: Final answer
    x = 166,721.34

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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.