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Finding the Fourth Proportional to 478.55, 660.31 and 345.98

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Solution

The fourth proportional to 478.55, 660.31 and 345.98 is: 477.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.55 : 660.31 = 345.98 : x
  2. Step 2: Convert to fraction form
    478.55/660.31 = 345.98/x
  3. Step 3: Cross multiply
    478.55x = 660.31 × 345.98
  4. Step 4: Simplify right side
    478.55x = 228,449.02
  5. Step 5: Solve for x
    x = 228,449.02/478.55
  6. Step 6: Final answer
    x = 477.38

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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.