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Finding the Fourth Proportional to 939.85, 1,297.11 and 541.50

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Solution

The fourth proportional to 939.85, 1,297.11 and 541.50 is: 747.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.85 : 1,297.11 = 541.50 : x
  2. Step 2: Convert to fraction form
    939.85/1,297.11 = 541.50/x
  3. Step 3: Cross multiply
    939.85x = 1,297.11 × 541.50
  4. Step 4: Simplify right side
    939.85x = 702,382.23
  5. Step 5: Solve for x
    x = 702,382.23/939.85
  6. Step 6: Final answer
    x = 747.34

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1.5x scale

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.