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Finding the Fourth Proportional to 869.66, 1,303.26 and 653

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Solution

The fourth proportional to 869.66, 1,303.26 and 653 is: 978.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    869.66 : 1,303.26 = 653 : x
  2. Step 2: Convert to fraction form
    869.66/1,303.26 = 653/x
  3. Step 3: Cross multiply
    869.66x = 1,303.26 × 653
  4. Step 4: Simplify right side
    869.66x = 851,028.78
  5. Step 5: Solve for x
    x = 851,028.78/869.66
  6. Step 6: Final answer
    x = 978.58

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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.