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Finding the Fourth Proportional to 155.99, 234.05 and 59.78

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Solution

The fourth proportional to 155.99, 234.05 and 59.78 is: 89.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    155.99 : 234.05 = 59.78 : x
  2. Step 2: Convert to fraction form
    155.99/234.05 = 59.78/x
  3. Step 3: Cross multiply
    155.99x = 234.05 × 59.78
  4. Step 4: Simplify right side
    155.99x = 13,991.51
  5. Step 5: Solve for x
    x = 13,991.51/155.99
  6. Step 6: Final answer
    x = 89.69

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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.