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Finding the Fourth Proportional to 407.76, 611.36 and 215.52

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Solution

The fourth proportional to 407.76, 611.36 and 215.52 is: 323.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    407.76 : 611.36 = 215.52 : x
  2. Step 2: Convert to fraction form
    407.76/611.36 = 215.52/x
  3. Step 3: Cross multiply
    407.76x = 611.36 × 215.52
  4. Step 4: Simplify right side
    407.76x = 131,760.31
  5. Step 5: Solve for x
    x = 131,760.31/407.76
  6. Step 6: Final answer
    x = 323.13

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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.