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Finding the Fourth Proportional to 354.84, 488.88 and 281.40

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Solution

The fourth proportional to 354.84, 488.88 and 281.40 is: 387.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    354.84 : 488.88 = 281.40 : x
  2. Step 2: Convert to fraction form
    354.84/488.88 = 281.40/x
  3. Step 3: Cross multiply
    354.84x = 488.88 × 281.40
  4. Step 4: Simplify right side
    354.84x = 137,570.83
  5. Step 5: Solve for x
    x = 137,570.83/354.84
  6. Step 6: Final answer
    x = 387.70

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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.