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Finding the Fourth Proportional to 660.54, 990.86 and 539.66

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Solution

The fourth proportional to 660.54, 990.86 and 539.66 is: 809.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.54 : 990.86 = 539.66 : x
  2. Step 2: Convert to fraction form
    660.54/990.86 = 539.66/x
  3. Step 3: Cross multiply
    660.54x = 990.86 × 539.66
  4. Step 4: Simplify right side
    660.54x = 534,727.51
  5. Step 5: Solve for x
    x = 534,727.51/660.54
  6. Step 6: Final answer
    x = 809.53

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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.