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Finding the Fourth Proportional to 155.61, 215.03 and 123.12

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Solution

The fourth proportional to 155.61, 215.03 and 123.12 is: 170.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    155.61 : 215.03 = 123.12 : x
  2. Step 2: Convert to fraction form
    155.61/215.03 = 123.12/x
  3. Step 3: Cross multiply
    155.61x = 215.03 × 123.12
  4. Step 4: Simplify right side
    155.61x = 26,473.88
  5. Step 5: Solve for x
    x = 26,473.88/155.61
  6. Step 6: Final answer
    x = 170.13

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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.