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Finding the Fourth Proportional to 312.65, 469.02 and 117.74

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Solution

The fourth proportional to 312.65, 469.02 and 117.74 is: 176.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.65 : 469.02 = 117.74 : x
  2. Step 2: Convert to fraction form
    312.65/469.02 = 117.74/x
  3. Step 3: Cross multiply
    312.65x = 469.02 × 117.74
  4. Step 4: Simplify right side
    312.65x = 55,220.07
  5. Step 5: Solve for x
    x = 55,220.07/312.65
  6. Step 6: Final answer
    x = 176.62

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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.