Home / 21,438.64-32,118-12,647.44

Finding the Fourth Proportional to 21,438.64, 32,118 and 12,647.44

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Solution

The fourth proportional to 21,438.64, 32,118 and 12,647.44 is: 18,947.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,438.64 : 32,118 = 12,647.44 : x
  2. Step 2: Convert to fraction form
    21,438.64/32,118 = 12,647.44/x
  3. Step 3: Cross multiply
    21,438.64x = 32,118 × 12,647.44
  4. Step 4: Simplify right side
    21,438.64x = 406,210,477.92
  5. Step 5: Solve for x
    x = 406,210,477.92/21,438.64
  6. Step 6: Final answer
    x = 18,947.59

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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.