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Finding the Fourth Proportional to 813.30, 1,122.72 and 518.96

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Solution

The fourth proportional to 813.30, 1,122.72 and 518.96 is: 716.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    813.30 : 1,122.72 = 518.96 : x
  2. Step 2: Convert to fraction form
    813.30/1,122.72 = 518.96/x
  3. Step 3: Cross multiply
    813.30x = 1,122.72 × 518.96
  4. Step 4: Simplify right side
    813.30x = 582,646.77
  5. Step 5: Solve for x
    x = 582,646.77/813.30
  6. Step 6: Final answer
    x = 716.40

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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.