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Finding the Fourth Proportional to 660.72, 909.48 and 550.47

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Solution

The fourth proportional to 660.72, 909.48 and 550.47 is: 757.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.72 : 909.48 = 550.47 : x
  2. Step 2: Convert to fraction form
    660.72/909.48 = 550.47/x
  3. Step 3: Cross multiply
    660.72x = 909.48 × 550.47
  4. Step 4: Simplify right side
    660.72x = 500,641.46
  5. Step 5: Solve for x
    x = 500,641.46/660.72
  6. Step 6: Final answer
    x = 757.72

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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.