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Finding the Fourth Proportional to 672.89, 1,001.93 and 665.54

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Solution

The fourth proportional to 672.89, 1,001.93 and 665.54 is: 990.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.89 : 1,001.93 = 665.54 : x
  2. Step 2: Convert to fraction form
    672.89/1,001.93 = 665.54/x
  3. Step 3: Cross multiply
    672.89x = 1,001.93 × 665.54
  4. Step 4: Simplify right side
    672.89x = 666,816.15
  5. Step 5: Solve for x
    x = 666,816.15/672.89
  6. Step 6: Final answer
    x = 990.98

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.