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Finding the Fourth Proportional to 550.95, 756.26 and 487.40

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Solution

The fourth proportional to 550.95, 756.26 and 487.40 is: 669.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    550.95 : 756.26 = 487.40 : x
  2. Step 2: Convert to fraction form
    550.95/756.26 = 487.40/x
  3. Step 3: Cross multiply
    550.95x = 756.26 × 487.40
  4. Step 4: Simplify right side
    550.95x = 368,596.73
  5. Step 5: Solve for x
    x = 368,596.73/550.95
  6. Step 6: Final answer
    x = 669.02

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.