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Finding the Fourth Proportional to 1,422.32, 2,128.08 and 1,242.08

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Solution

The fourth proportional to 1,422.32, 2,128.08 and 1,242.08 is: 1,858.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,422.32 : 2,128.08 = 1,242.08 : x
  2. Step 2: Convert to fraction form
    1,422.32/2,128.08 = 1,242.08/x
  3. Step 3: Cross multiply
    1,422.32x = 2,128.08 × 1,242.08
  4. Step 4: Simplify right side
    1,422.32x = 2,643,245.61
  5. Step 5: Solve for x
    x = 2,643,245.61/1,422.32
  6. Step 6: Final answer
    x = 1,858.40

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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.