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Finding the Fourth Proportional to 478.14, 660.32 and 312.29

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Solution

The fourth proportional to 478.14, 660.32 and 312.29 is: 431.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.14 : 660.32 = 312.29 : x
  2. Step 2: Convert to fraction form
    478.14/660.32 = 312.29/x
  3. Step 3: Cross multiply
    478.14x = 660.32 × 312.29
  4. Step 4: Simplify right side
    478.14x = 206,210.12
  5. Step 5: Solve for x
    x = 206,210.12/478.14
  6. Step 6: Final answer
    x = 431.28

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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.