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Finding the Fourth Proportional to 718.02, 989.69 and 551.97

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Solution

The fourth proportional to 718.02, 989.69 and 551.97 is: 760.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.02 : 989.69 = 551.97 : x
  2. Step 2: Convert to fraction form
    718.02/989.69 = 551.97/x
  3. Step 3: Cross multiply
    718.02x = 989.69 × 551.97
  4. Step 4: Simplify right side
    718.02x = 546,276.43
  5. Step 5: Solve for x
    x = 546,276.43/718.02
  6. Step 6: Final answer
    x = 760.81

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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.