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Finding the Fourth Proportional to 1,403.94, 2,105.85 and 430.11

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Solution

The fourth proportional to 1,403.94, 2,105.85 and 430.11 is: 645.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,403.94 : 2,105.85 = 430.11 : x
  2. Step 2: Convert to fraction form
    1,403.94/2,105.85 = 430.11/x
  3. Step 3: Cross multiply
    1,403.94x = 2,105.85 × 430.11
  4. Step 4: Simplify right side
    1,403.94x = 905,747.14
  5. Step 5: Solve for x
    x = 905,747.14/1,403.94
  6. Step 6: Final answer
    x = 645.15

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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.