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Finding the Fourth Proportional to 407.32, 610.56 and 215.08

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Solution

The fourth proportional to 407.32, 610.56 and 215.08 is: 322.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    407.32 : 610.56 = 215.08 : x
  2. Step 2: Convert to fraction form
    407.32/610.56 = 215.08/x
  3. Step 3: Cross multiply
    407.32x = 610.56 × 215.08
  4. Step 4: Simplify right side
    407.32x = 131,319.24
  5. Step 5: Solve for x
    x = 131,319.24/407.32
  6. Step 6: Final answer
    x = 322.40

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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.