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Finding the Fourth Proportional to 645.62, 971.91 and 556.34

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Solution

The fourth proportional to 645.62, 971.91 and 556.34 is: 837.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    645.62 : 971.91 = 556.34 : x
  2. Step 2: Convert to fraction form
    645.62/971.91 = 556.34/x
  3. Step 3: Cross multiply
    645.62x = 971.91 × 556.34
  4. Step 4: Simplify right side
    645.62x = 540,707.55
  5. Step 5: Solve for x
    x = 540,707.55/645.62
  6. Step 6: Final answer
    x = 837.51

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.