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Finding the Fourth Proportional to 1,138.43, 1,707.62 and 368.93

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Solution

The fourth proportional to 1,138.43, 1,707.62 and 368.93 is: 553.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,138.43 : 1,707.62 = 368.93 : x
  2. Step 2: Convert to fraction form
    1,138.43/1,707.62 = 368.93/x
  3. Step 3: Cross multiply
    1,138.43x = 1,707.62 × 368.93
  4. Step 4: Simplify right side
    1,138.43x = 629,981.86
  5. Step 5: Solve for x
    x = 629,981.86/1,138.43
  6. Step 6: Final answer
    x = 553.38

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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.