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Finding the Fourth Proportional to 100.02, 150.03 and 90.57

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Solution

The fourth proportional to 100.02, 150.03 and 90.57 is: 135.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.02 : 150.03 = 90.57 : x
  2. Step 2: Convert to fraction form
    100.02/150.03 = 90.57/x
  3. Step 3: Cross multiply
    100.02x = 150.03 × 90.57
  4. Step 4: Simplify right side
    100.02x = 13,588.22
  5. Step 5: Solve for x
    x = 13,588.22/100.02
  6. Step 6: Final answer
    x = 135.86

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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.