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Finding the Fourth Proportional to 648.30, 972.69 and 258.33

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Solution

The fourth proportional to 648.30, 972.69 and 258.33 is: 387.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    648.30 : 972.69 = 258.33 : x
  2. Step 2: Convert to fraction form
    648.30/972.69 = 258.33/x
  3. Step 3: Cross multiply
    648.30x = 972.69 × 258.33
  4. Step 4: Simplify right side
    648.30x = 251,275.01
  5. Step 5: Solve for x
    x = 251,275.01/648.30
  6. Step 6: Final answer
    x = 387.59

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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.