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Finding the Fourth Proportional to 312.94, 469.28 and 130.28

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Solution

The fourth proportional to 312.94, 469.28 and 130.28 is: 195.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.94 : 469.28 = 130.28 : x
  2. Step 2: Convert to fraction form
    312.94/469.28 = 130.28/x
  3. Step 3: Cross multiply
    312.94x = 469.28 × 130.28
  4. Step 4: Simplify right side
    312.94x = 61,137.80
  5. Step 5: Solve for x
    x = 61,137.80/312.94
  6. Step 6: Final answer
    x = 195.37

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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.