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Finding the Fourth Proportional to 751.12, 1,125.31 and 553.94

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Solution

The fourth proportional to 751.12, 1,125.31 and 553.94 is: 829.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    751.12 : 1,125.31 = 553.94 : x
  2. Step 2: Convert to fraction form
    751.12/1,125.31 = 553.94/x
  3. Step 3: Cross multiply
    751.12x = 1,125.31 × 553.94
  4. Step 4: Simplify right side
    751.12x = 623,355.65
  5. Step 5: Solve for x
    x = 623,355.65/751.12
  6. Step 6: Final answer
    x = 829.90

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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.