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Finding the Fourth Proportional to 628.17, 867.17 and 418.70

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Solution

The fourth proportional to 628.17, 867.17 and 418.70 is: 578.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.17 : 867.17 = 418.70 : x
  2. Step 2: Convert to fraction form
    628.17/867.17 = 418.70/x
  3. Step 3: Cross multiply
    628.17x = 867.17 × 418.70
  4. Step 4: Simplify right side
    628.17x = 363,079.74
  5. Step 5: Solve for x
    x = 363,079.74/628.17
  6. Step 6: Final answer
    x = 578.00

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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.