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Finding the Fourth Proportional to 1,124.11, 1,685.13 and 684.28

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Solution

The fourth proportional to 1,124.11, 1,685.13 and 684.28 is: 1,025.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,124.11 : 1,685.13 = 684.28 : x
  2. Step 2: Convert to fraction form
    1,124.11/1,685.13 = 684.28/x
  3. Step 3: Cross multiply
    1,124.11x = 1,685.13 × 684.28
  4. Step 4: Simplify right side
    1,124.11x = 1,153,100.76
  5. Step 5: Solve for x
    x = 1,153,100.76/1,124.11
  6. Step 6: Final answer
    x = 1,025.79

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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.