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Finding the Fourth Proportional to 913.16, 1,370.25 and 906.21

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Solution

The fourth proportional to 913.16, 1,370.25 and 906.21 is: 1,359.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    913.16 : 1,370.25 = 906.21 : x
  2. Step 2: Convert to fraction form
    913.16/1,370.25 = 906.21/x
  3. Step 3: Cross multiply
    913.16x = 1,370.25 × 906.21
  4. Step 4: Simplify right side
    913.16x = 1,241,734.25
  5. Step 5: Solve for x
    x = 1,241,734.25/913.16
  6. Step 6: Final answer
    x = 1,359.82

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.