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Finding the Fourth Proportional to 1,088.76, 1,631.52 and 858.21

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Solution

The fourth proportional to 1,088.76, 1,631.52 and 858.21 is: 1,286.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,088.76 : 1,631.52 = 858.21 : x
  2. Step 2: Convert to fraction form
    1,088.76/1,631.52 = 858.21/x
  3. Step 3: Cross multiply
    1,088.76x = 1,631.52 × 858.21
  4. Step 4: Simplify right side
    1,088.76x = 1,400,186.78
  5. Step 5: Solve for x
    x = 1,400,186.78/1,088.76
  6. Step 6: Final answer
    x = 1,286.04

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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.