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Finding the Fourth Proportional to 1,224.82, 1,690.26 and 665.30

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Solution

The fourth proportional to 1,224.82, 1,690.26 and 665.30 is: 918.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,224.82 : 1,690.26 = 665.30 : x
  2. Step 2: Convert to fraction form
    1,224.82/1,690.26 = 665.30/x
  3. Step 3: Cross multiply
    1,224.82x = 1,690.26 × 665.30
  4. Step 4: Simplify right side
    1,224.82x = 1,124,535.45
  5. Step 5: Solve for x
    x = 1,124,535.45/1,224.82
  6. Step 6: Final answer
    x = 918.12

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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.