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Finding the Fourth Proportional to 1,406.80, 2,109.40 and 432.72

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Solution

The fourth proportional to 1,406.80, 2,109.40 and 432.72 is: 648.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,406.80 : 2,109.40 = 432.72 : x
  2. Step 2: Convert to fraction form
    1,406.80/2,109.40 = 432.72/x
  3. Step 3: Cross multiply
    1,406.80x = 2,109.40 × 432.72
  4. Step 4: Simplify right side
    1,406.80x = 912,779.57
  5. Step 5: Solve for x
    x = 912,779.57/1,406.80
  6. Step 6: Final answer
    x = 648.83

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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.