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Finding the Fourth Proportional to 1,406.85, 2,109.99 and 432.72

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Solution

The fourth proportional to 1,406.85, 2,109.99 and 432.72 is: 648.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,406.85 : 2,109.99 = 432.72 : x
  2. Step 2: Convert to fraction form
    1,406.85/2,109.99 = 432.72/x
  3. Step 3: Cross multiply
    1,406.85x = 2,109.99 × 432.72
  4. Step 4: Simplify right side
    1,406.85x = 913,034.87
  5. Step 5: Solve for x
    x = 913,034.87/1,406.85
  6. Step 6: Final answer
    x = 648.99

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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.