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Finding the Fourth Proportional to 1,403.66, 2,105.67 and 429.59

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Solution

The fourth proportional to 1,403.66, 2,105.67 and 429.59 is: 644.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,403.66 : 2,105.67 = 429.59 : x
  2. Step 2: Convert to fraction form
    1,403.66/2,105.67 = 429.59/x
  3. Step 3: Cross multiply
    1,403.66x = 2,105.67 × 429.59
  4. Step 4: Simplify right side
    1,403.66x = 904,574.78
  5. Step 5: Solve for x
    x = 904,574.78/1,403.66
  6. Step 6: Final answer
    x = 644.44

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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.