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Finding the Fourth Proportional to 1,143.58, 1,715.10 and 656.38

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Solution

The fourth proportional to 1,143.58, 1,715.10 and 656.38 is: 984.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,143.58 : 1,715.10 = 656.38 : x
  2. Step 2: Convert to fraction form
    1,143.58/1,715.10 = 656.38/x
  3. Step 3: Cross multiply
    1,143.58x = 1,715.10 × 656.38
  4. Step 4: Simplify right side
    1,143.58x = 1,125,757.34
  5. Step 5: Solve for x
    x = 1,125,757.34/1,143.58
  6. Step 6: Final answer
    x = 984.42

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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.