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Finding the Fourth Proportional to 105.18, 156.89 and 90.57

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Solution

The fourth proportional to 105.18, 156.89 and 90.57 is: 135.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.18 : 156.89 = 90.57 : x
  2. Step 2: Convert to fraction form
    105.18/156.89 = 90.57/x
  3. Step 3: Cross multiply
    105.18x = 156.89 × 90.57
  4. Step 4: Simplify right side
    105.18x = 14,209.07
  5. Step 5: Solve for x
    x = 14,209.07/105.18
  6. Step 6: Final answer
    x = 135.09

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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.