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Finding the Fourth Proportional to 618.40, 929.40 and 539.20

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Solution

The fourth proportional to 618.40, 929.40 and 539.20 is: 810.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.40 : 929.40 = 539.20 : x
  2. Step 2: Convert to fraction form
    618.40/929.40 = 539.20/x
  3. Step 3: Cross multiply
    618.40x = 929.40 × 539.20
  4. Step 4: Simplify right side
    618.40x = 501,132.48
  5. Step 5: Solve for x
    x = 501,132.48/618.40
  6. Step 6: Final answer
    x = 810.37

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.