Home / 12,390.72-17,100-7,086.24

Finding the Fourth Proportional to 12,390.72, 17,100 and 7,086.24

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Solution

The fourth proportional to 12,390.72, 17,100 and 7,086.24 is: 9,779.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,390.72 : 17,100 = 7,086.24 : x
  2. Step 2: Convert to fraction form
    12,390.72/17,100 = 7,086.24/x
  3. Step 3: Cross multiply
    12,390.72x = 17,100 × 7,086.24
  4. Step 4: Simplify right side
    12,390.72x = 121,174,704
  5. Step 5: Solve for x
    x = 121,174,704/12,390.72
  6. Step 6: Final answer
    x = 9,779.47

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.