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Finding the Fourth Proportional to 279,325.20, 418,987.80 and 217,040.40

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Solution

The fourth proportional to 279,325.20, 418,987.80 and 217,040.40 is: 325,560.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    279,325.20 : 418,987.80 = 217,040.40 : x
  2. Step 2: Convert to fraction form
    279,325.20/418,987.80 = 217,040.40/x
  3. Step 3: Cross multiply
    279,325.20x = 418,987.80 × 217,040.40
  4. Step 4: Simplify right side
    279,325.20x = 90,937,279,707.12
  5. Step 5: Solve for x
    x = 90,937,279,707.12/279,325.20
  6. Step 6: Final answer
    x = 325,560.60

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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.