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Finding the Fourth Proportional to 1,308.17, 1,805.25 and 718.70

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Solution

The fourth proportional to 1,308.17, 1,805.25 and 718.70 is: 991.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,308.17 : 1,805.25 = 718.70 : x
  2. Step 2: Convert to fraction form
    1,308.17/1,805.25 = 718.70/x
  3. Step 3: Cross multiply
    1,308.17x = 1,805.25 × 718.70
  4. Step 4: Simplify right side
    1,308.17x = 1,297,426.84
  5. Step 5: Solve for x
    x = 1,297,426.84/1,308.17
  6. Step 6: Final answer
    x = 991.79

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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.