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Finding the Fourth Proportional to 312.85, 469.50 and 117.89

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Solution

The fourth proportional to 312.85, 469.50 and 117.89 is: 176.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.85 : 469.50 = 117.89 : x
  2. Step 2: Convert to fraction form
    312.85/469.50 = 117.89/x
  3. Step 3: Cross multiply
    312.85x = 469.50 × 117.89
  4. Step 4: Simplify right side
    312.85x = 55,349.65
  5. Step 5: Solve for x
    x = 55,349.65/312.85
  6. Step 6: Final answer
    x = 176.92

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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.