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Finding the Fourth Proportional to 153.13, 228.39 and 139.36

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Solution

The fourth proportional to 153.13, 228.39 and 139.36 is: 207.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    153.13 : 228.39 = 139.36 : x
  2. Step 2: Convert to fraction form
    153.13/228.39 = 139.36/x
  3. Step 3: Cross multiply
    153.13x = 228.39 × 139.36
  4. Step 4: Simplify right side
    153.13x = 31,828.43
  5. Step 5: Solve for x
    x = 31,828.43/153.13
  6. Step 6: Final answer
    x = 207.85

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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.