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Finding the Fourth Proportional to 886.18, 1,222.38 and 720.40

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Solution

The fourth proportional to 886.18, 1,222.38 and 720.40 is: 993.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    886.18 : 1,222.38 = 720.40 : x
  2. Step 2: Convert to fraction form
    886.18/1,222.38 = 720.40/x
  3. Step 3: Cross multiply
    886.18x = 1,222.38 × 720.40
  4. Step 4: Simplify right side
    886.18x = 880,602.55
  5. Step 5: Solve for x
    x = 880,602.55/886.18
  6. Step 6: Final answer
    x = 993.71

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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.