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Finding the Fourth Proportional to 312.94, 469.49 and 156.86

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Solution

The fourth proportional to 312.94, 469.49 and 156.86 is: 235.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.94 : 469.49 = 156.86 : x
  2. Step 2: Convert to fraction form
    312.94/469.49 = 156.86/x
  3. Step 3: Cross multiply
    312.94x = 469.49 × 156.86
  4. Step 4: Simplify right side
    312.94x = 73,642.64
  5. Step 5: Solve for x
    x = 73,642.64/312.94
  6. Step 6: Final answer
    x = 235.33

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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.