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Finding the Fourth Proportional to 813.55, 1,119.12 and 680.71

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Solution

The fourth proportional to 813.55, 1,119.12 and 680.71 is: 936.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    813.55 : 1,119.12 = 680.71 : x
  2. Step 2: Convert to fraction form
    813.55/1,119.12 = 680.71/x
  3. Step 3: Cross multiply
    813.55x = 1,119.12 × 680.71
  4. Step 4: Simplify right side
    813.55x = 761,796.18
  5. Step 5: Solve for x
    x = 761,796.18/813.55
  6. Step 6: Final answer
    x = 936.39

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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.