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Finding the Fourth Proportional to 312.74, 469 and 130.18

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Solution

The fourth proportional to 312.74, 469 and 130.18 is: 195.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.74 : 469 = 130.18 : x
  2. Step 2: Convert to fraction form
    312.74/469 = 130.18/x
  3. Step 3: Cross multiply
    312.74x = 469 × 130.18
  4. Step 4: Simplify right side
    312.74x = 61,054.42
  5. Step 5: Solve for x
    x = 61,054.42/312.74
  6. Step 6: Final answer
    x = 195.23

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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.