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Finding the Fourth Proportional to 813.93, 1,122.15 and 703.17

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Solution

The fourth proportional to 813.93, 1,122.15 and 703.17 is: 969.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    813.93 : 1,122.15 = 703.17 : x
  2. Step 2: Convert to fraction form
    813.93/1,122.15 = 703.17/x
  3. Step 3: Cross multiply
    813.93x = 1,122.15 × 703.17
  4. Step 4: Simplify right side
    813.93x = 789,062.22
  5. Step 5: Solve for x
    x = 789,062.22/813.93
  6. Step 6: Final answer
    x = 969.45

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Double scale
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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.