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Finding the Fourth Proportional to 155.50, 214.59 and 103.75

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Solution

The fourth proportional to 155.50, 214.59 and 103.75 is: 143.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    155.50 : 214.59 = 103.75 : x
  2. Step 2: Convert to fraction form
    155.50/214.59 = 103.75/x
  3. Step 3: Cross multiply
    155.50x = 214.59 × 103.75
  4. Step 4: Simplify right side
    155.50x = 22,263.71
  5. Step 5: Solve for x
    x = 22,263.71/155.50
  6. Step 6: Final answer
    x = 143.18

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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.