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Finding the Fourth Proportional to 114.12, 156.96 and 89.28

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Solution

The fourth proportional to 114.12, 156.96 and 89.28 is: 122.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    114.12 : 156.96 = 89.28 : x
  2. Step 2: Convert to fraction form
    114.12/156.96 = 89.28/x
  3. Step 3: Cross multiply
    114.12x = 156.96 × 89.28
  4. Step 4: Simplify right side
    114.12x = 14,013.39
  5. Step 5: Solve for x
    x = 14,013.39/114.12
  6. Step 6: Final answer
    x = 122.80

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.