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Finding the Fourth Proportional to 886.95, 1,222.92 and 690.12

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Solution

The fourth proportional to 886.95, 1,222.92 and 690.12 is: 951.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    886.95 : 1,222.92 = 690.12 : x
  2. Step 2: Convert to fraction form
    886.95/1,222.92 = 690.12/x
  3. Step 3: Cross multiply
    886.95x = 1,222.92 × 690.12
  4. Step 4: Simplify right side
    886.95x = 843,961.55
  5. Step 5: Solve for x
    x = 843,961.55/886.95
  6. Step 6: Final answer
    x = 951.53

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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.