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Finding the Fourth Proportional to 756.58, 1,131.96 and 551.21

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Solution

The fourth proportional to 756.58, 1,131.96 and 551.21 is: 824.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    756.58 : 1,131.96 = 551.21 : x
  2. Step 2: Convert to fraction form
    756.58/1,131.96 = 551.21/x
  3. Step 3: Cross multiply
    756.58x = 1,131.96 × 551.21
  4. Step 4: Simplify right side
    756.58x = 623,947.67
  5. Step 5: Solve for x
    x = 623,947.67/756.58
  6. Step 6: Final answer
    x = 824.69

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.