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Finding the Fourth Proportional to 348.72, 478.12 and 342.60

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Solution

The fourth proportional to 348.72, 478.12 and 342.60 is: 469.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    348.72 : 478.12 = 342.60 : x
  2. Step 2: Convert to fraction form
    348.72/478.12 = 342.60/x
  3. Step 3: Cross multiply
    348.72x = 478.12 × 342.60
  4. Step 4: Simplify right side
    348.72x = 163,803.91
  5. Step 5: Solve for x
    x = 163,803.91/348.72
  6. Step 6: Final answer
    x = 469.73

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.