Home / 1,403.90-2,105.85-429.88

Finding the Fourth Proportional to 1,403.90, 2,105.85 and 429.88

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Solution

The fourth proportional to 1,403.90, 2,105.85 and 429.88 is: 644.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,403.90 : 2,105.85 = 429.88 : x
  2. Step 2: Convert to fraction form
    1,403.90/2,105.85 = 429.88/x
  3. Step 3: Cross multiply
    1,403.90x = 2,105.85 × 429.88
  4. Step 4: Simplify right side
    1,403.90x = 905,259.15
  5. Step 5: Solve for x
    x = 905,259.15/1,403.90
  6. Step 6: Final answer
    x = 644.82

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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.