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Finding the Fourth Proportional to 478.20, 660.06 and 347.40

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Solution

The fourth proportional to 478.20, 660.06 and 347.40 is: 479.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    478.20 : 660.06 = 347.40 : x
  2. Step 2: Convert to fraction form
    478.20/660.06 = 347.40/x
  3. Step 3: Cross multiply
    478.20x = 660.06 × 347.40
  4. Step 4: Simplify right side
    478.20x = 229,304.84
  5. Step 5: Solve for x
    x = 229,304.84/478.20
  6. Step 6: Final answer
    x = 479.52

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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.