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Finding the Fourth Proportional to 654.90, 900.96 and 636.68

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Solution

The fourth proportional to 654.90, 900.96 and 636.68 is: 875.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    654.90 : 900.96 = 636.68 : x
  2. Step 2: Convert to fraction form
    654.90/900.96 = 636.68/x
  3. Step 3: Cross multiply
    654.90x = 900.96 × 636.68
  4. Step 4: Simplify right side
    654.90x = 573,618.71
  5. Step 5: Solve for x
    x = 573,618.71/654.90
  6. Step 6: Final answer
    x = 875.89

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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.