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Finding the Fourth Proportional to 1,138.70, 1,708.05 and 369.20

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Solution

The fourth proportional to 1,138.70, 1,708.05 and 369.20 is: 553.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,138.70 : 1,708.05 = 369.20 : x
  2. Step 2: Convert to fraction form
    1,138.70/1,708.05 = 369.20/x
  3. Step 3: Cross multiply
    1,138.70x = 1,708.05 × 369.20
  4. Step 4: Simplify right side
    1,138.70x = 630,612.06
  5. Step 5: Solve for x
    x = 630,612.06/1,138.70
  6. Step 6: Final answer
    x = 553.80

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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.