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Finding the Fourth Proportional to 320.32, 477.86 and 305.20

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Solution

The fourth proportional to 320.32, 477.86 and 305.20 is: 455.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    320.32 : 477.86 = 305.20 : x
  2. Step 2: Convert to fraction form
    320.32/477.86 = 305.20/x
  3. Step 3: Cross multiply
    320.32x = 477.86 × 305.20
  4. Step 4: Simplify right side
    320.32x = 145,842.87
  5. Step 5: Solve for x
    x = 145,842.87/320.32
  6. Step 6: Final answer
    x = 455.30

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.