Home / 21,399.90-32,099.85-19,431.60

Finding the Fourth Proportional to 21,399.90, 32,099.85 and 19,431.60

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Solution

The fourth proportional to 21,399.90, 32,099.85 and 19,431.60 is: 29,147.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,399.90 : 32,099.85 = 19,431.60 : x
  2. Step 2: Convert to fraction form
    21,399.90/32,099.85 = 19,431.60/x
  3. Step 3: Cross multiply
    21,399.90x = 32,099.85 × 19,431.60
  4. Step 4: Simplify right side
    21,399.90x = 623,751,445.26
  5. Step 5: Solve for x
    x = 623,751,445.26/21,399.90
  6. Step 6: Final answer
    x = 29,147.40

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1.5x scale

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.