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Finding the Fourth Proportional to 1,215.32, 1,823.22 and 393.55

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Solution

The fourth proportional to 1,215.32, 1,823.22 and 393.55 is: 590.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,215.32 : 1,823.22 = 393.55 : x
  2. Step 2: Convert to fraction form
    1,215.32/1,823.22 = 393.55/x
  3. Step 3: Cross multiply
    1,215.32x = 1,823.22 × 393.55
  4. Step 4: Simplify right side
    1,215.32x = 717,523.67
  5. Step 5: Solve for x
    x = 717,523.67/1,215.32
  6. Step 6: Final answer
    x = 590.40

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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.