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Finding the Fourth Proportional to 634.94, 875.95 and 386.21

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Solution

The fourth proportional to 634.94, 875.95 and 386.21 is: 532.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    634.94 : 875.95 = 386.21 : x
  2. Step 2: Convert to fraction form
    634.94/875.95 = 386.21/x
  3. Step 3: Cross multiply
    634.94x = 875.95 × 386.21
  4. Step 4: Simplify right side
    634.94x = 338,301.87
  5. Step 5: Solve for x
    x = 338,301.87/634.94
  6. Step 6: Final answer
    x = 532.81

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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.