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Finding the Fourth Proportional to 948.09, 1,422.40 and 688.35

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Solution

The fourth proportional to 948.09, 1,422.40 and 688.35 is: 1,032.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    948.09 : 1,422.40 = 688.35 : x
  2. Step 2: Convert to fraction form
    948.09/1,422.40 = 688.35/x
  3. Step 3: Cross multiply
    948.09x = 1,422.40 × 688.35
  4. Step 4: Simplify right side
    948.09x = 979,100.21
  5. Step 5: Solve for x
    x = 979,100.21/948.09
  6. Step 6: Final answer
    x = 1,032.71

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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.