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Finding the Fourth Proportional to 1,134.28, 1,698.18 and 858.76

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Solution

The fourth proportional to 1,134.28, 1,698.18 and 858.76 is: 1,285.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,134.28 : 1,698.18 = 858.76 : x
  2. Step 2: Convert to fraction form
    1,134.28/1,698.18 = 858.76/x
  3. Step 3: Cross multiply
    1,134.28x = 1,698.18 × 858.76
  4. Step 4: Simplify right side
    1,134.28x = 1,458,329.06
  5. Step 5: Solve for x
    x = 1,458,329.06/1,134.28
  6. Step 6: Final answer
    x = 1,285.69

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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.