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Finding the Fourth Proportional to 751.40, 1,127.10 and 629.90

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Solution

The fourth proportional to 751.40, 1,127.10 and 629.90 is: 944.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    751.40 : 1,127.10 = 629.90 : x
  2. Step 2: Convert to fraction form
    751.40/1,127.10 = 629.90/x
  3. Step 3: Cross multiply
    751.40x = 1,127.10 × 629.90
  4. Step 4: Simplify right side
    751.40x = 709,960.29
  5. Step 5: Solve for x
    x = 709,960.29/751.40
  6. Step 6: Final answer
    x = 944.85

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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.