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Finding the Fourth Proportional to 628.74, 867.58 and 393.02

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Solution

The fourth proportional to 628.74, 867.58 and 393.02 is: 542.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.74 : 867.58 = 393.02 : x
  2. Step 2: Convert to fraction form
    628.74/867.58 = 393.02/x
  3. Step 3: Cross multiply
    628.74x = 867.58 × 393.02
  4. Step 4: Simplify right side
    628.74x = 340,976.29
  5. Step 5: Solve for x
    x = 340,976.29/628.74
  6. Step 6: Final answer
    x = 542.32

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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.