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Finding the Fourth Proportional to 114.36, 156.78 and 111.30

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Solution

The fourth proportional to 114.36, 156.78 and 111.30 is: 152.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    114.36 : 156.78 = 111.30 : x
  2. Step 2: Convert to fraction form
    114.36/156.78 = 111.30/x
  3. Step 3: Cross multiply
    114.36x = 156.78 × 111.30
  4. Step 4: Simplify right side
    114.36x = 17,449.61
  5. Step 5: Solve for x
    x = 17,449.61/114.36
  6. Step 6: Final answer
    x = 152.58

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.