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Finding the Fourth Proportional to 634.22, 875.54 and 398.51

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Solution

The fourth proportional to 634.22, 875.54 and 398.51 is: 550.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    634.22 : 875.54 = 398.51 : x
  2. Step 2: Convert to fraction form
    634.22/875.54 = 398.51/x
  3. Step 3: Cross multiply
    634.22x = 875.54 × 398.51
  4. Step 4: Simplify right side
    634.22x = 348,911.45
  5. Step 5: Solve for x
    x = 348,911.45/634.22
  6. Step 6: Final answer
    x = 550.14

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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.