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Finding the Fourth Proportional to 478.77, 661.01 and 331.35

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Solution

The fourth proportional to 478.77, 661.01 and 331.35 is: 457.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.77 : 661.01 = 331.35 : x
  2. Step 2: Convert to fraction form
    478.77/661.01 = 331.35/x
  3. Step 3: Cross multiply
    478.77x = 661.01 × 331.35
  4. Step 4: Simplify right side
    478.77x = 219,024.01
  5. Step 5: Solve for x
    x = 219,024.01/478.77
  6. Step 6: Final answer
    x = 457.47

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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.