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Finding the Fourth Proportional to 1,403.15, 2,105 and 478.76

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Solution

The fourth proportional to 1,403.15, 2,105 and 478.76 is: 718.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,403.15 : 2,105 = 478.76 : x
  2. Step 2: Convert to fraction form
    1,403.15/2,105 = 478.76/x
  3. Step 3: Cross multiply
    1,403.15x = 2,105 × 478.76
  4. Step 4: Simplify right side
    1,403.15x = 1,007,789.80
  5. Step 5: Solve for x
    x = 1,007,789.80/1,403.15
  6. Step 6: Final answer
    x = 718.23

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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.