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Finding the Fourth Proportional to 1,140.48, 1,708.92 and 908.40

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Solution

The fourth proportional to 1,140.48, 1,708.92 and 908.40 is: 1,361.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,140.48 : 1,708.92 = 908.40 : x
  2. Step 2: Convert to fraction form
    1,140.48/1,708.92 = 908.40/x
  3. Step 3: Cross multiply
    1,140.48x = 1,708.92 × 908.40
  4. Step 4: Simplify right side
    1,140.48x = 1,552,382.93
  5. Step 5: Solve for x
    x = 1,552,382.93/1,140.48
  6. Step 6: Final answer
    x = 1,361.17

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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.