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Finding the Fourth Proportional to 339.86, 468.77 and 312.32

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Solution

The fourth proportional to 339.86, 468.77 and 312.32 is: 430.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    339.86 : 468.77 = 312.32 : x
  2. Step 2: Convert to fraction form
    339.86/468.77 = 312.32/x
  3. Step 3: Cross multiply
    339.86x = 468.77 × 312.32
  4. Step 4: Simplify right side
    339.86x = 146,406.25
  5. Step 5: Solve for x
    x = 146,406.25/339.86
  6. Step 6: Final answer
    x = 430.78

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.