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Finding the Fourth Proportional to 628.50, 867.02 and 392.52

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Solution

The fourth proportional to 628.50, 867.02 and 392.52 is: 541.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.50 : 867.02 = 392.52 : x
  2. Step 2: Convert to fraction form
    628.50/867.02 = 392.52/x
  3. Step 3: Cross multiply
    628.50x = 867.02 × 392.52
  4. Step 4: Simplify right side
    628.50x = 340,322.69
  5. Step 5: Solve for x
    x = 340,322.69/628.50
  6. Step 6: Final answer
    x = 541.48

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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.