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Finding the Fourth Proportional to 155.40, 214.52 and 100.23

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Solution

The fourth proportional to 155.40, 214.52 and 100.23 is: 138.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    155.40 : 214.52 = 100.23 : x
  2. Step 2: Convert to fraction form
    155.40/214.52 = 100.23/x
  3. Step 3: Cross multiply
    155.40x = 214.52 × 100.23
  4. Step 4: Simplify right side
    155.40x = 21,501.59
  5. Step 5: Solve for x
    x = 21,501.59/155.40
  6. Step 6: Final answer
    x = 138.37

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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.