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Finding the Fourth Proportional to 153.12, 228.64 and 145.23

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Solution

The fourth proportional to 153.12, 228.64 and 145.23 is: 216.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.12 : 228.64 = 145.23 : x
  2. Step 2: Convert to fraction form
    153.12/228.64 = 145.23/x
  3. Step 3: Cross multiply
    153.12x = 228.64 × 145.23
  4. Step 4: Simplify right side
    153.12x = 33,205.39
  5. Step 5: Solve for x
    x = 33,205.39/153.12
  6. Step 6: Final answer
    x = 216.86

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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.