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Finding the Fourth Proportional to 1,403.57, 2,105.58 and 478.91

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Solution

The fourth proportional to 1,403.57, 2,105.58 and 478.91 is: 718.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,403.57 : 2,105.58 = 478.91 : x
  2. Step 2: Convert to fraction form
    1,403.57/2,105.58 = 478.91/x
  3. Step 3: Cross multiply
    1,403.57x = 2,105.58 × 478.91
  4. Step 4: Simplify right side
    1,403.57x = 1,008,388.31
  5. Step 5: Solve for x
    x = 1,008,388.31/1,403.57
  6. Step 6: Final answer
    x = 718.44

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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.