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Finding the Fourth Proportional to 155.40, 214.31 and 103.00

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Solution

The fourth proportional to 155.40, 214.31 and 103.00 is: 142.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    155.40 : 214.31 = 103.00 : x
  2. Step 2: Convert to fraction form
    155.40/214.31 = 103.00/x
  3. Step 3: Cross multiply
    155.40x = 214.31 × 103.00
  4. Step 4: Simplify right side
    155.40x = 22,073.78
  5. Step 5: Solve for x
    x = 22,073.78/155.40
  6. Step 6: Final answer
    x = 142.04

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.