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Finding the Fourth Proportional to 3,129.63, 4,695.05 and 1,398.25

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Solution

The fourth proportional to 3,129.63, 4,695.05 and 1,398.25 is: 2,097.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,129.63 : 4,695.05 = 1,398.25 : x
  2. Step 2: Convert to fraction form
    3,129.63/4,695.05 = 1,398.25/x
  3. Step 3: Cross multiply
    3,129.63x = 4,695.05 × 1,398.25
  4. Step 4: Simplify right side
    3,129.63x = 6,564,853.66
  5. Step 5: Solve for x
    x = 6,564,853.66/3,129.63
  6. Step 6: Final answer
    x = 2,097.65

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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.