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Finding the Fourth Proportional to 153.55, 229.28 and 139.87

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Solution

The fourth proportional to 153.55, 229.28 and 139.87 is: 208.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.55 : 229.28 = 139.87 : x
  2. Step 2: Convert to fraction form
    153.55/229.28 = 139.87/x
  3. Step 3: Cross multiply
    153.55x = 229.28 × 139.87
  4. Step 4: Simplify right side
    153.55x = 32,069.39
  5. Step 5: Solve for x
    x = 32,069.39/153.55
  6. Step 6: Final answer
    x = 208.85

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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.