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Finding the Fourth Proportional to 260,279.20, 390,418.80 and 155,216.80

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Solution

The fourth proportional to 260,279.20, 390,418.80 and 155,216.80 is: 232,825.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    260,279.20 : 390,418.80 = 155,216.80 : x
  2. Step 2: Convert to fraction form
    260,279.20/390,418.80 = 155,216.80/x
  3. Step 3: Cross multiply
    260,279.20x = 390,418.80 × 155,216.80
  4. Step 4: Simplify right side
    260,279.20x = 60,599,556,795.84
  5. Step 5: Solve for x
    x = 60,599,556,795.84/260,279.20
  6. Step 6: Final answer
    x = 232,825.20

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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.