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Finding the Fourth Proportional to 651.61, 902.99 and 639.30

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Solution

The fourth proportional to 651.61, 902.99 and 639.30 is: 885.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    651.61 : 902.99 = 639.30 : x
  2. Step 2: Convert to fraction form
    651.61/902.99 = 639.30/x
  3. Step 3: Cross multiply
    651.61x = 902.99 × 639.30
  4. Step 4: Simplify right side
    651.61x = 577,281.51
  5. Step 5: Solve for x
    x = 577,281.51/651.61
  6. Step 6: Final answer
    x = 885.93

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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.