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Finding the Fourth Proportional to 648.51, 972.76 and 215.65

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Solution

The fourth proportional to 648.51, 972.76 and 215.65 is: 323.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    648.51 : 972.76 = 215.65 : x
  2. Step 2: Convert to fraction form
    648.51/972.76 = 215.65/x
  3. Step 3: Cross multiply
    648.51x = 972.76 × 215.65
  4. Step 4: Simplify right side
    648.51x = 209,775.69
  5. Step 5: Solve for x
    x = 209,775.69/648.51
  6. Step 6: Final answer
    x = 323.47

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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.