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Finding the Fourth Proportional to 917.22, 1,264.21 and 717.76

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Solution

The fourth proportional to 917.22, 1,264.21 and 717.76 is: 989.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.22 : 1,264.21 = 717.76 : x
  2. Step 2: Convert to fraction form
    917.22/1,264.21 = 717.76/x
  3. Step 3: Cross multiply
    917.22x = 1,264.21 × 717.76
  4. Step 4: Simplify right side
    917.22x = 907,399.16
  5. Step 5: Solve for x
    x = 907,399.16/917.22
  6. Step 6: Final answer
    x = 989.29

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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.