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Finding the Fourth Proportional to 187.50, 281.40 and 90.03

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Solution

The fourth proportional to 187.50, 281.40 and 90.03 is: 135.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    187.50 : 281.40 = 90.03 : x
  2. Step 2: Convert to fraction form
    187.50/281.40 = 90.03/x
  3. Step 3: Cross multiply
    187.50x = 281.40 × 90.03
  4. Step 4: Simplify right side
    187.50x = 25,334.44
  5. Step 5: Solve for x
    x = 25,334.44/187.50
  6. Step 6: Final answer
    x = 135.12

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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.