Home / 21,422.76-32,139.81-8,938.64

Finding the Fourth Proportional to 21,422.76, 32,139.81 and 8,938.64

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Solution

The fourth proportional to 21,422.76, 32,139.81 and 8,938.64 is: 13,410.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,422.76 : 32,139.81 = 8,938.64 : x
  2. Step 2: Convert to fraction form
    21,422.76/32,139.81 = 8,938.64/x
  3. Step 3: Cross multiply
    21,422.76x = 32,139.81 × 8,938.64
  4. Step 4: Simplify right side
    21,422.76x = 287,286,030.56
  5. Step 5: Solve for x
    x = 287,286,030.56/21,422.76
  6. Step 6: Final answer
    x = 13,410.32

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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.