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Finding the Fourth Proportional to 1,399.68, 2,100 and 630.24

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Solution

The fourth proportional to 1,399.68, 2,100 and 630.24 is: 945.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,399.68 : 2,100 = 630.24 : x
  2. Step 2: Convert to fraction form
    1,399.68/2,100 = 630.24/x
  3. Step 3: Cross multiply
    1,399.68x = 2,100 × 630.24
  4. Step 4: Simplify right side
    1,399.68x = 1,323,504
  5. Step 5: Solve for x
    x = 1,323,504/1,399.68
  6. Step 6: Final answer
    x = 945.58

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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.