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Finding the Fourth Proportional to 948.15, 1,422.95 and 639.27

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Solution

The fourth proportional to 948.15, 1,422.95 and 639.27 is: 959.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    948.15 : 1,422.95 = 639.27 : x
  2. Step 2: Convert to fraction form
    948.15/1,422.95 = 639.27/x
  3. Step 3: Cross multiply
    948.15x = 1,422.95 × 639.27
  4. Step 4: Simplify right side
    948.15x = 909,646.05
  5. Step 5: Solve for x
    x = 909,646.05/948.15
  6. Step 6: Final answer
    x = 959.39

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.