Home / 9,115.74-12,579.63-5,138.13

Finding the Fourth Proportional to 9,115.74, 12,579.63 and 5,138.13

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Solution

The fourth proportional to 9,115.74, 12,579.63 and 5,138.13 is: 7,090.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,115.74 : 12,579.63 = 5,138.13 : x
  2. Step 2: Convert to fraction form
    9,115.74/12,579.63 = 5,138.13/x
  3. Step 3: Cross multiply
    9,115.74x = 12,579.63 × 5,138.13
  4. Step 4: Simplify right side
    9,115.74x = 64,635,774.29
  5. Step 5: Solve for x
    x = 64,635,774.29/9,115.74
  6. Step 6: Final answer
    x = 7,090.57

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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.