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Finding the Fourth Proportional to 228.90, 315.90 and 130.68

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Solution

The fourth proportional to 228.90, 315.90 and 130.68 is: 180.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    228.90 : 315.90 = 130.68 : x
  2. Step 2: Convert to fraction form
    228.90/315.90 = 130.68/x
  3. Step 3: Cross multiply
    228.90x = 315.90 × 130.68
  4. Step 4: Simplify right side
    228.90x = 41,281.81
  5. Step 5: Solve for x
    x = 41,281.81/228.90
  6. Step 6: Final answer
    x = 180.35

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.