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Finding the Fourth Proportional to 90.70, 135.42 and 90.06

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Solution

The fourth proportional to 90.70, 135.42 and 90.06 is: 134.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.70 : 135.42 = 90.06 : x
  2. Step 2: Convert to fraction form
    90.70/135.42 = 90.06/x
  3. Step 3: Cross multiply
    90.70x = 135.42 × 90.06
  4. Step 4: Simplify right side
    90.70x = 12,196.35
  5. Step 5: Solve for x
    x = 12,196.35/90.70
  6. Step 6: Final answer
    x = 134.46

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.