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Finding the Fourth Proportional to 1,422.42, 2,132.08 and 728.13

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Solution

The fourth proportional to 1,422.42, 2,132.08 and 728.13 is: 1,091.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,422.42 : 2,132.08 = 728.13 : x
  2. Step 2: Convert to fraction form
    1,422.42/2,132.08 = 728.13/x
  3. Step 3: Cross multiply
    1,422.42x = 2,132.08 × 728.13
  4. Step 4: Simplify right side
    1,422.42x = 1,552,427.71
  5. Step 5: Solve for x
    x = 1,552,427.71/1,422.42
  6. Step 6: Final answer
    x = 1,091.40

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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.