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Finding the Fourth Proportional to 716.61, 989.40 and 550.53

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Solution

The fourth proportional to 716.61, 989.40 and 550.53 is: 760.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    716.61 : 989.40 = 550.53 : x
  2. Step 2: Convert to fraction form
    716.61/989.40 = 550.53/x
  3. Step 3: Cross multiply
    716.61x = 989.40 × 550.53
  4. Step 4: Simplify right side
    716.61x = 544,686.68
  5. Step 5: Solve for x
    x = 544,686.68/716.61
  6. Step 6: Final answer
    x = 760.09

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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.