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Finding the Fourth Proportional to 714.51, 1,071.72 and 648.42

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Solution

The fourth proportional to 714.51, 1,071.72 and 648.42 is: 972.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    714.51 : 1,071.72 = 648.42 : x
  2. Step 2: Convert to fraction form
    714.51/1,071.72 = 648.42/x
  3. Step 3: Cross multiply
    714.51x = 1,071.72 × 648.42
  4. Step 4: Simplify right side
    714.51x = 694,924.68
  5. Step 5: Solve for x
    x = 694,924.68/714.51
  6. Step 6: Final answer
    x = 972.59

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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.