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Finding the Fourth Proportional to 718.93, 991.20 and 551.07

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Solution

The fourth proportional to 718.93, 991.20 and 551.07 is: 759.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.93 : 991.20 = 551.07 : x
  2. Step 2: Convert to fraction form
    718.93/991.20 = 551.07/x
  3. Step 3: Cross multiply
    718.93x = 991.20 × 551.07
  4. Step 4: Simplify right side
    718.93x = 546,222.65
  5. Step 5: Solve for x
    x = 546,222.65/718.93
  6. Step 6: Final answer
    x = 759.78

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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.