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Finding the Fourth Proportional to 634.78, 875.10 and 401.50

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Solution

The fourth proportional to 634.78, 875.10 and 401.50 is: 553.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    634.78 : 875.10 = 401.50 : x
  2. Step 2: Convert to fraction form
    634.78/875.10 = 401.50/x
  3. Step 3: Cross multiply
    634.78x = 875.10 × 401.50
  4. Step 4: Simplify right side
    634.78x = 351,352.65
  5. Step 5: Solve for x
    x = 351,352.65/634.78
  6. Step 6: Final answer
    x = 553.50

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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.