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Finding the Fourth Proportional to 1,009.46, 1,515.17 and 644.49

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Solution

The fourth proportional to 1,009.46, 1,515.17 and 644.49 is: 967.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,009.46 : 1,515.17 = 644.49 : x
  2. Step 2: Convert to fraction form
    1,009.46/1,515.17 = 644.49/x
  3. Step 3: Cross multiply
    1,009.46x = 1,515.17 × 644.49
  4. Step 4: Simplify right side
    1,009.46x = 976,513.52
  5. Step 5: Solve for x
    x = 976,513.52/1,009.46
  6. Step 6: Final answer
    x = 967.36

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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.