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Finding the Fourth Proportional to 101.76, 153.36 and 90

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Solution

The fourth proportional to 101.76, 153.36 and 90 is: 135.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    101.76 : 153.36 = 90 : x
  2. Step 2: Convert to fraction form
    101.76/153.36 = 90/x
  3. Step 3: Cross multiply
    101.76x = 153.36 × 90
  4. Step 4: Simplify right side
    101.76x = 13,802.40
  5. Step 5: Solve for x
    x = 13,802.40/101.76
  6. Step 6: Final answer
    x = 135.64

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.