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Finding the Fourth Proportional to 786.13, 1,086.36 and 653.21

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Solution

The fourth proportional to 786.13, 1,086.36 and 653.21 is: 902.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    786.13 : 1,086.36 = 653.21 : x
  2. Step 2: Convert to fraction form
    786.13/1,086.36 = 653.21/x
  3. Step 3: Cross multiply
    786.13x = 1,086.36 × 653.21
  4. Step 4: Simplify right side
    786.13x = 709,627.19
  5. Step 5: Solve for x
    x = 709,627.19/786.13
  6. Step 6: Final answer
    x = 902.68

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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.