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Finding the Fourth Proportional to 647.17, 971.66 and 617.81

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Solution

The fourth proportional to 647.17, 971.66 and 617.81 is: 927.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    647.17 : 971.66 = 617.81 : x
  2. Step 2: Convert to fraction form
    647.17/971.66 = 617.81/x
  3. Step 3: Cross multiply
    647.17x = 971.66 × 617.81
  4. Step 4: Simplify right side
    647.17x = 600,301.26
  5. Step 5: Solve for x
    x = 600,301.26/647.17
  6. Step 6: Final answer
    x = 927.58

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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.