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Finding the Fourth Proportional to 675.45, 1,015.34 and 646.65

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Solution

The fourth proportional to 675.45, 1,015.34 and 646.65 is: 972.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    675.45 : 1,015.34 = 646.65 : x
  2. Step 2: Convert to fraction form
    675.45/1,015.34 = 646.65/x
  3. Step 3: Cross multiply
    675.45x = 1,015.34 × 646.65
  4. Step 4: Simplify right side
    675.45x = 656,566.38
  5. Step 5: Solve for x
    x = 656,566.38/675.45
  6. Step 6: Final answer
    x = 972.04

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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.