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Finding the Fourth Proportional to 312.81, 468.96 and 130.10

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Solution

The fourth proportional to 312.81, 468.96 and 130.10 is: 195.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.81 : 468.96 = 130.10 : x
  2. Step 2: Convert to fraction form
    312.81/468.96 = 130.10/x
  3. Step 3: Cross multiply
    312.81x = 468.96 × 130.10
  4. Step 4: Simplify right side
    312.81x = 61,009.35
  5. Step 5: Solve for x
    x = 61,009.35/312.81
  6. Step 6: Final answer
    x = 195.04

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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.