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Finding the Fourth Proportional to 1,400.40, 2,100.48 and 427.12

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Solution

The fourth proportional to 1,400.40, 2,100.48 and 427.12 is: 640.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,400.40 : 2,100.48 = 427.12 : x
  2. Step 2: Convert to fraction form
    1,400.40/2,100.48 = 427.12/x
  3. Step 3: Cross multiply
    1,400.40x = 2,100.48 × 427.12
  4. Step 4: Simplify right side
    1,400.40x = 897,157.02
  5. Step 5: Solve for x
    x = 897,157.02/1,400.40
  6. Step 6: Final answer
    x = 640.64

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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.