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Finding the Fourth Proportional to 1,001.23, 1,382.28 and 665.16

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Solution

The fourth proportional to 1,001.23, 1,382.28 and 665.16 is: 918.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,001.23 : 1,382.28 = 665.16 : x
  2. Step 2: Convert to fraction form
    1,001.23/1,382.28 = 665.16/x
  3. Step 3: Cross multiply
    1,001.23x = 1,382.28 × 665.16
  4. Step 4: Simplify right side
    1,001.23x = 919,437.36
  5. Step 5: Solve for x
    x = 919,437.36/1,001.23
  6. Step 6: Final answer
    x = 918.31

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.