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Finding the Fourth Proportional to 1,138.60, 1,707.90 and 825.40

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Solution

The fourth proportional to 1,138.60, 1,707.90 and 825.40 is: 1,238.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,138.60 : 1,707.90 = 825.40 : x
  2. Step 2: Convert to fraction form
    1,138.60/1,707.90 = 825.40/x
  3. Step 3: Cross multiply
    1,138.60x = 1,707.90 × 825.40
  4. Step 4: Simplify right side
    1,138.60x = 1,409,700.66
  5. Step 5: Solve for x
    x = 1,409,700.66/1,138.60
  6. Step 6: Final answer
    x = 1,238.10

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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.