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Finding the Fourth Proportional to 1,114.43, 1,671.31 and 420.60

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Solution

The fourth proportional to 1,114.43, 1,671.31 and 420.60 is: 630.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,114.43 : 1,671.31 = 420.60 : x
  2. Step 2: Convert to fraction form
    1,114.43/1,671.31 = 420.60/x
  3. Step 3: Cross multiply
    1,114.43x = 1,671.31 × 420.60
  4. Step 4: Simplify right side
    1,114.43x = 702,952.99
  5. Step 5: Solve for x
    x = 702,952.99/1,114.43
  6. Step 6: Final answer
    x = 630.77

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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.