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Finding the Fourth Proportional to 948.20, 1,422.30 and 839.40

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Solution

The fourth proportional to 948.20, 1,422.30 and 839.40 is: 1,259.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    948.20 : 1,422.30 = 839.40 : x
  2. Step 2: Convert to fraction form
    948.20/1,422.30 = 839.40/x
  3. Step 3: Cross multiply
    948.20x = 1,422.30 × 839.40
  4. Step 4: Simplify right side
    948.20x = 1,193,878.62
  5. Step 5: Solve for x
    x = 1,193,878.62/948.20
  6. Step 6: Final answer
    x = 1,259.10

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1.5x scale

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.