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Finding the Fourth Proportional to 541.80, 747.70 and 320.74

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Solution

The fourth proportional to 541.80, 747.70 and 320.74 is: 442.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    541.80 : 747.70 = 320.74 : x
  2. Step 2: Convert to fraction form
    541.80/747.70 = 320.74/x
  3. Step 3: Cross multiply
    541.80x = 747.70 × 320.74
  4. Step 4: Simplify right side
    541.80x = 239,817.30
  5. Step 5: Solve for x
    x = 239,817.30/541.80
  6. Step 6: Final answer
    x = 442.63

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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.