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Finding the Fourth Proportional to 1,308.08, 1,805.12 and 718.61

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Solution

The fourth proportional to 1,308.08, 1,805.12 and 718.61 is: 991.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,308.08 : 1,805.12 = 718.61 : x
  2. Step 2: Convert to fraction form
    1,308.08/1,805.12 = 718.61/x
  3. Step 3: Cross multiply
    1,308.08x = 1,805.12 × 718.61
  4. Step 4: Simplify right side
    1,308.08x = 1,297,170.05
  5. Step 5: Solve for x
    x = 1,297,170.05/1,308.08
  6. Step 6: Final answer
    x = 991.66

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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.