Home / 1,642.25-2,266.09-979.17

Finding the Fourth Proportional to 1,642.25, 2,266.09 and 979.17

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Solution

The fourth proportional to 1,642.25, 2,266.09 and 979.17 is: 1,351.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,642.25 : 2,266.09 = 979.17 : x
  2. Step 2: Convert to fraction form
    1,642.25/2,266.09 = 979.17/x
  3. Step 3: Cross multiply
    1,642.25x = 2,266.09 × 979.17
  4. Step 4: Simplify right side
    1,642.25x = 2,218,887.35
  5. Step 5: Solve for x
    x = 2,218,887.35/1,642.25
  6. Step 6: Final answer
    x = 1,351.13

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1.5x scale

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.