Home / 9,117.20-12,581.80-5,138.16

Finding the Fourth Proportional to 9,117.20, 12,581.80 and 5,138.16

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Solution

The fourth proportional to 9,117.20, 12,581.80 and 5,138.16 is: 7,090.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,117.20 : 12,581.80 = 5,138.16 : x
  2. Step 2: Convert to fraction form
    9,117.20/12,581.80 = 5,138.16/x
  3. Step 3: Cross multiply
    9,117.20x = 12,581.80 × 5,138.16
  4. Step 4: Simplify right side
    9,117.20x = 64,647,301.49
  5. Step 5: Solve for x
    x = 64,647,301.49/9,117.20
  6. Step 6: Final answer
    x = 7,090.70

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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.