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Finding the Fourth Proportional to 216.47, 298.13 and 215.80

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Solution

The fourth proportional to 216.47, 298.13 and 215.80 is: 297.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    216.47 : 298.13 = 215.80 : x
  2. Step 2: Convert to fraction form
    216.47/298.13 = 215.80/x
  3. Step 3: Cross multiply
    216.47x = 298.13 × 215.80
  4. Step 4: Simplify right side
    216.47x = 64,334.63
  5. Step 5: Solve for x
    x = 64,334.63/216.47
  6. Step 6: Final answer
    x = 297.20

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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.