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Finding the Fourth Proportional to 751.55, 1,130.63 and 628.56

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Solution

The fourth proportional to 751.55, 1,130.63 and 628.56 is: 945.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    751.55 : 1,130.63 = 628.56 : x
  2. Step 2: Convert to fraction form
    751.55/1,130.63 = 628.56/x
  3. Step 3: Cross multiply
    751.55x = 1,130.63 × 628.56
  4. Step 4: Simplify right side
    751.55x = 710,665.65
  5. Step 5: Solve for x
    x = 710,665.65/751.55
  6. Step 6: Final answer
    x = 945.61

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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.