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Finding the Fourth Proportional to 913.93, 1,261.91 and 912.11

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Solution

The fourth proportional to 913.93, 1,261.91 and 912.11 is: 1,259.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    913.93 : 1,261.91 = 912.11 : x
  2. Step 2: Convert to fraction form
    913.93/1,261.91 = 912.11/x
  3. Step 3: Cross multiply
    913.93x = 1,261.91 × 912.11
  4. Step 4: Simplify right side
    913.93x = 1,150,996.70
  5. Step 5: Solve for x
    x = 1,150,996.70/913.93
  6. Step 6: Final answer
    x = 1,259.40

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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.