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Finding the Fourth Proportional to 312.69, 468.71 and 117.60

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Solution

The fourth proportional to 312.69, 468.71 and 117.60 is: 176.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.69 : 468.71 = 117.60 : x
  2. Step 2: Convert to fraction form
    312.69/468.71 = 117.60/x
  3. Step 3: Cross multiply
    312.69x = 468.71 × 117.60
  4. Step 4: Simplify right side
    312.69x = 55,119.71
  5. Step 5: Solve for x
    x = 55,119.71/312.69
  6. Step 6: Final answer
    x = 176.28

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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.