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Finding the Fourth Proportional to 644.18, 888.77 and 458.15

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Solution

The fourth proportional to 644.18, 888.77 and 458.15 is: 632.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.18 : 888.77 = 458.15 : x
  2. Step 2: Convert to fraction form
    644.18/888.77 = 458.15/x
  3. Step 3: Cross multiply
    644.18x = 888.77 × 458.15
  4. Step 4: Simplify right side
    644.18x = 407,186.68
  5. Step 5: Solve for x
    x = 407,186.68/644.18
  6. Step 6: Final answer
    x = 632.11

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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.