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Finding the Fourth Proportional to 1,403.31, 2,104.96 and 478.39

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Solution

The fourth proportional to 1,403.31, 2,104.96 and 478.39 is: 717.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,403.31 : 2,104.96 = 478.39 : x
  2. Step 2: Convert to fraction form
    1,403.31/2,104.96 = 478.39/x
  3. Step 3: Cross multiply
    1,403.31x = 2,104.96 × 478.39
  4. Step 4: Simplify right side
    1,403.31x = 1,006,991.81
  5. Step 5: Solve for x
    x = 1,006,991.81/1,403.31
  6. Step 6: Final answer
    x = 717.58

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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.