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Finding the Fourth Proportional to 312.86, 469.34 and 130.15

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Solution

The fourth proportional to 312.86, 469.34 and 130.15 is: 195.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.86 : 469.34 = 130.15 : x
  2. Step 2: Convert to fraction form
    312.86/469.34 = 130.15/x
  3. Step 3: Cross multiply
    312.86x = 469.34 × 130.15
  4. Step 4: Simplify right side
    312.86x = 61,084.60
  5. Step 5: Solve for x
    x = 61,084.60/312.86
  6. Step 6: Final answer
    x = 195.25

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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.