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Finding the Fourth Proportional to 1,403.90, 2,105.68 and 479.55

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Solution

The fourth proportional to 1,403.90, 2,105.68 and 479.55 is: 719.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,403.90 : 2,105.68 = 479.55 : x
  2. Step 2: Convert to fraction form
    1,403.90/2,105.68 = 479.55/x
  3. Step 3: Cross multiply
    1,403.90x = 2,105.68 × 479.55
  4. Step 4: Simplify right side
    1,403.90x = 1,009,786.44
  5. Step 5: Solve for x
    x = 1,009,786.44/1,403.90
  6. Step 6: Final answer
    x = 719.27

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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.