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Finding the Fourth Proportional to 261,330.60, 391,121.10 and 229,837.80

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Solution

The fourth proportional to 261,330.60, 391,121.10 and 229,837.80 is: 343,987.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,330.60 : 391,121.10 = 229,837.80 : x
  2. Step 2: Convert to fraction form
    261,330.60/391,121.10 = 229,837.80/x
  3. Step 3: Cross multiply
    261,330.60x = 391,121.10 × 229,837.80
  4. Step 4: Simplify right side
    261,330.60x = 89,894,413,157.58
  5. Step 5: Solve for x
    x = 89,894,413,157.58/261,330.60
  6. Step 6: Final answer
    x = 343,987.32

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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.