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Finding the Fourth Proportional to 478.59, 661.01 and 348.18

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Solution

The fourth proportional to 478.59, 661.01 and 348.18 is: 480.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.59 : 661.01 = 348.18 : x
  2. Step 2: Convert to fraction form
    478.59/661.01 = 348.18/x
  3. Step 3: Cross multiply
    478.59x = 661.01 × 348.18
  4. Step 4: Simplify right side
    478.59x = 230,148.72
  5. Step 5: Solve for x
    x = 230,148.72/478.59
  6. Step 6: Final answer
    x = 480.89

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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.