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Finding the Fourth Proportional to 285.24, 393.65 and 215.18

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Solution

The fourth proportional to 285.24, 393.65 and 215.18 is: 296.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.24 : 393.65 = 215.18 : x
  2. Step 2: Convert to fraction form
    285.24/393.65 = 215.18/x
  3. Step 3: Cross multiply
    285.24x = 393.65 × 215.18
  4. Step 4: Simplify right side
    285.24x = 84,706.06
  5. Step 5: Solve for x
    x = 84,706.06/285.24
  6. Step 6: Final answer
    x = 296.96

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.