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Finding the Fourth Proportional to 155.69, 215.03 and 106.48

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Solution

The fourth proportional to 155.69, 215.03 and 106.48 is: 147.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    155.69 : 215.03 = 106.48 : x
  2. Step 2: Convert to fraction form
    155.69/215.03 = 106.48/x
  3. Step 3: Cross multiply
    155.69x = 215.03 × 106.48
  4. Step 4: Simplify right side
    155.69x = 22,896.26
  5. Step 5: Solve for x
    x = 22,896.26/155.69
  6. Step 6: Final answer
    x = 147.07

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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.