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Finding the Fourth Proportional to 407.68, 611.64 and 215.26

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Solution

The fourth proportional to 407.68, 611.64 and 215.26 is: 322.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    407.68 : 611.64 = 215.26 : x
  2. Step 2: Convert to fraction form
    407.68/611.64 = 215.26/x
  3. Step 3: Cross multiply
    407.68x = 611.64 × 215.26
  4. Step 4: Simplify right side
    407.68x = 131,661.63
  5. Step 5: Solve for x
    x = 131,661.63/407.68
  6. Step 6: Final answer
    x = 322.95

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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.