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Finding the Fourth Proportional to 354.50, 488.93 and 310.76

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Solution

The fourth proportional to 354.50, 488.93 and 310.76 is: 428.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    354.50 : 488.93 = 310.76 : x
  2. Step 2: Convert to fraction form
    354.50/488.93 = 310.76/x
  3. Step 3: Cross multiply
    354.50x = 488.93 × 310.76
  4. Step 4: Simplify right side
    354.50x = 151,935.89
  5. Step 5: Solve for x
    x = 151,935.89/354.50
  6. Step 6: Final answer
    x = 428.60

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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.