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Finding the Fourth Proportional to 948.26, 1,422.18 and 485.46

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Solution

The fourth proportional to 948.26, 1,422.18 and 485.46 is: 728.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    948.26 : 1,422.18 = 485.46 : x
  2. Step 2: Convert to fraction form
    948.26/1,422.18 = 485.46/x
  3. Step 3: Cross multiply
    948.26x = 1,422.18 × 485.46
  4. Step 4: Simplify right side
    948.26x = 690,411.50
  5. Step 5: Solve for x
    x = 690,411.50/948.26
  6. Step 6: Final answer
    x = 728.08

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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.