Home / 21,129.76-31,671.85-13,739.52

Finding the Fourth Proportional to 21,129.76, 31,671.85 and 13,739.52

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Solution

The fourth proportional to 21,129.76, 31,671.85 and 13,739.52 is: 20,594.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,129.76 : 31,671.85 = 13,739.52 : x
  2. Step 2: Convert to fraction form
    21,129.76/31,671.85 = 13,739.52/x
  3. Step 3: Cross multiply
    21,129.76x = 31,671.85 × 13,739.52
  4. Step 4: Simplify right side
    21,129.76x = 435,156,016.51
  5. Step 5: Solve for x
    x = 435,156,016.51/21,129.76
  6. Step 6: Final answer
    x = 20,594.46

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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.