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Finding the Fourth Proportional to 150.98, 208.40 and 85.50

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Solution

The fourth proportional to 150.98, 208.40 and 85.50 is: 118.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    150.98 : 208.40 = 85.50 : x
  2. Step 2: Convert to fraction form
    150.98/208.40 = 85.50/x
  3. Step 3: Cross multiply
    150.98x = 208.40 × 85.50
  4. Step 4: Simplify right side
    150.98x = 17,817.77
  5. Step 5: Solve for x
    x = 17,817.77/150.98
  6. Step 6: Final answer
    x = 118.02

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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.