Home / 10,139.31-15,219.90-8,513.64

Finding the Fourth Proportional to 10,139.31, 15,219.90 and 8,513.64

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Solution

The fourth proportional to 10,139.31, 15,219.90 and 8,513.64 is: 12,779.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,139.31 : 15,219.90 = 8,513.64 : x
  2. Step 2: Convert to fraction form
    10,139.31/15,219.90 = 8,513.64/x
  3. Step 3: Cross multiply
    10,139.31x = 15,219.90 × 8,513.64
  4. Step 4: Simplify right side
    10,139.31x = 129,576,749.44
  5. Step 5: Solve for x
    x = 129,576,749.44/10,139.31
  6. Step 6: Final answer
    x = 12,779.64

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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.