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Finding the Fourth Proportional to 1,086.26, 1,625.70 and 653.72

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Solution

The fourth proportional to 1,086.26, 1,625.70 and 653.72 is: 978.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,086.26 : 1,625.70 = 653.72 : x
  2. Step 2: Convert to fraction form
    1,086.26/1,625.70 = 653.72/x
  3. Step 3: Cross multiply
    1,086.26x = 1,625.70 × 653.72
  4. Step 4: Simplify right side
    1,086.26x = 1,062,752.60
  5. Step 5: Solve for x
    x = 1,062,752.60/1,086.26
  6. Step 6: Final answer
    x = 978.36

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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.