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Finding the Fourth Proportional to 879.70, 1,214.88 and 617.26

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Solution

The fourth proportional to 879.70, 1,214.88 and 617.26 is: 852.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.70 : 1,214.88 = 617.26 : x
  2. Step 2: Convert to fraction form
    879.70/1,214.88 = 617.26/x
  3. Step 3: Cross multiply
    879.70x = 1,214.88 × 617.26
  4. Step 4: Simplify right side
    879.70x = 749,896.83
  5. Step 5: Solve for x
    x = 749,896.83/879.70
  6. Step 6: Final answer
    x = 852.45

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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.