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Finding the Fourth Proportional to 348.80, 489.40 and 348.80

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Solution

The fourth proportional to 348.80, 489.40 and 348.80 is: 489.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    348.80 : 489.40 = 348.80 : x
  2. Step 2: Convert to fraction form
    348.80/489.40 = 348.80/x
  3. Step 3: Cross multiply
    348.80x = 489.40 × 348.80
  4. Step 4: Simplify right side
    348.80x = 170,702.72
  5. Step 5: Solve for x
    x = 170,702.72/348.80
  6. Step 6: Final answer
    x = 489.40

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.