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Finding the Fourth Proportional to 1,009.66, 1,514.50 and 665.20

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Solution

The fourth proportional to 1,009.66, 1,514.50 and 665.20 is: 997.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,009.66 : 1,514.50 = 665.20 : x
  2. Step 2: Convert to fraction form
    1,009.66/1,514.50 = 665.20/x
  3. Step 3: Cross multiply
    1,009.66x = 1,514.50 × 665.20
  4. Step 4: Simplify right side
    1,009.66x = 1,007,447.06
  5. Step 5: Solve for x
    x = 1,007,447.06/1,009.66
  6. Step 6: Final answer
    x = 997.81

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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.