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Finding the Fourth Proportional to 1,162.78, 1,604.49 and 665.35

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Solution

The fourth proportional to 1,162.78, 1,604.49 and 665.35 is: 918.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,162.78 : 1,604.49 = 665.35 : x
  2. Step 2: Convert to fraction form
    1,162.78/1,604.49 = 665.35/x
  3. Step 3: Cross multiply
    1,162.78x = 1,604.49 × 665.35
  4. Step 4: Simplify right side
    1,162.78x = 1,067,547.42
  5. Step 5: Solve for x
    x = 1,067,547.42/1,162.78
  6. Step 6: Final answer
    x = 918.10

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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.