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Finding the Fourth Proportional to 155.50, 232.86 and 139.30

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Solution

The fourth proportional to 155.50, 232.86 and 139.30 is: 208.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    155.50 : 232.86 = 139.30 : x
  2. Step 2: Convert to fraction form
    155.50/232.86 = 139.30/x
  3. Step 3: Cross multiply
    155.50x = 232.86 × 139.30
  4. Step 4: Simplify right side
    155.50x = 32,437.40
  5. Step 5: Solve for x
    x = 32,437.40/155.50
  6. Step 6: Final answer
    x = 208.60

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.