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Finding the Fourth Proportional to 1,403.90, 2,105.92 and 479.42

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Solution

The fourth proportional to 1,403.90, 2,105.92 and 479.42 is: 719.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,403.90 : 2,105.92 = 479.42 : x
  2. Step 2: Convert to fraction form
    1,403.90/2,105.92 = 479.42/x
  3. Step 3: Cross multiply
    1,403.90x = 2,105.92 × 479.42
  4. Step 4: Simplify right side
    1,403.90x = 1,009,620.17
  5. Step 5: Solve for x
    x = 1,009,620.17/1,403.90
  6. Step 6: Final answer
    x = 719.15

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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.