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Finding the Fourth Proportional to 911.15, 1,256.62 and 770.05

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Solution

The fourth proportional to 911.15, 1,256.62 and 770.05 is: 1,062.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    911.15 : 1,256.62 = 770.05 : x
  2. Step 2: Convert to fraction form
    911.15/1,256.62 = 770.05/x
  3. Step 3: Cross multiply
    911.15x = 1,256.62 × 770.05
  4. Step 4: Simplify right side
    911.15x = 967,656.38
  5. Step 5: Solve for x
    x = 967,656.38/911.15
  6. Step 6: Final answer
    x = 1,062.02

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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.