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Finding the Fourth Proportional to 651.54, 902.91 and 639.24

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Solution

The fourth proportional to 651.54, 902.91 and 639.24 is: 885.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    651.54 : 902.91 = 639.24 : x
  2. Step 2: Convert to fraction form
    651.54/902.91 = 639.24/x
  3. Step 3: Cross multiply
    651.54x = 902.91 × 639.24
  4. Step 4: Simplify right side
    651.54x = 577,176.19
  5. Step 5: Solve for x
    x = 577,176.19/651.54
  6. Step 6: Final answer
    x = 885.86

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.