Home / 21,407.31-32,120.20-8,929.79

Finding the Fourth Proportional to 21,407.31, 32,120.20 and 8,929.79

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Solution

The fourth proportional to 21,407.31, 32,120.20 and 8,929.79 is: 13,398.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,407.31 : 32,120.20 = 8,929.79 : x
  2. Step 2: Convert to fraction form
    21,407.31/32,120.20 = 8,929.79/x
  3. Step 3: Cross multiply
    21,407.31x = 32,120.20 × 8,929.79
  4. Step 4: Simplify right side
    21,407.31x = 286,826,742.22
  5. Step 5: Solve for x
    x = 286,826,742.22/21,407.31
  6. Step 6: Final answer
    x = 13,398.54

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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.