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Finding the Fourth Proportional to 228.91, 342.50 and 139.53

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Solution

The fourth proportional to 228.91, 342.50 and 139.53 is: 208.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    228.91 : 342.50 = 139.53 : x
  2. Step 2: Convert to fraction form
    228.91/342.50 = 139.53/x
  3. Step 3: Cross multiply
    228.91x = 342.50 × 139.53
  4. Step 4: Simplify right side
    228.91x = 47,789.03
  5. Step 5: Solve for x
    x = 47,789.03/228.91
  6. Step 6: Final answer
    x = 208.77

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.