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Finding the Fourth Proportional to 458.15, 687.51 and 198.11

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Solution

The fourth proportional to 458.15, 687.51 and 198.11 is: 297.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    458.15 : 687.51 = 198.11 : x
  2. Step 2: Convert to fraction form
    458.15/687.51 = 198.11/x
  3. Step 3: Cross multiply
    458.15x = 687.51 × 198.11
  4. Step 4: Simplify right side
    458.15x = 136,199.17
  5. Step 5: Solve for x
    x = 136,199.17/458.15
  6. Step 6: Final answer
    x = 297.28

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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.