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Finding the Fourth Proportional to 1,406.58, 2,109.25 and 432.15

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Solution

The fourth proportional to 1,406.58, 2,109.25 and 432.15 is: 648.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,406.58 : 2,109.25 = 432.15 : x
  2. Step 2: Convert to fraction form
    1,406.58/2,109.25 = 432.15/x
  3. Step 3: Cross multiply
    1,406.58x = 2,109.25 × 432.15
  4. Step 4: Simplify right side
    1,406.58x = 911,512.39
  5. Step 5: Solve for x
    x = 911,512.39/1,406.58
  6. Step 6: Final answer
    x = 648.03

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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.