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Finding the Fourth Proportional to 1,098.05, 1,515.26 and 649.91

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Solution

The fourth proportional to 1,098.05, 1,515.26 and 649.91 is: 896.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,098.05 : 1,515.26 = 649.91 : x
  2. Step 2: Convert to fraction form
    1,098.05/1,515.26 = 649.91/x
  3. Step 3: Cross multiply
    1,098.05x = 1,515.26 × 649.91
  4. Step 4: Simplify right side
    1,098.05x = 984,771.80
  5. Step 5: Solve for x
    x = 984,771.80/1,098.05
  6. Step 6: Final answer
    x = 896.84

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.