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Finding the Fourth Proportional to 716.89, 989.73 and 550.78

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Solution

The fourth proportional to 716.89, 989.73 and 550.78 is: 760.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    716.89 : 989.73 = 550.78 : x
  2. Step 2: Convert to fraction form
    716.89/989.73 = 550.78/x
  3. Step 3: Cross multiply
    716.89x = 989.73 × 550.78
  4. Step 4: Simplify right side
    716.89x = 545,123.49
  5. Step 5: Solve for x
    x = 545,123.49/716.89
  6. Step 6: Final answer
    x = 760.40

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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.