Home / 13,120.77-18,102.15-9,140.43

Finding the Fourth Proportional to 13,120.77, 18,102.15 and 9,140.43

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Solution

The fourth proportional to 13,120.77, 18,102.15 and 9,140.43 is: 12,610.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,120.77 : 18,102.15 = 9,140.43 : x
  2. Step 2: Convert to fraction form
    13,120.77/18,102.15 = 9,140.43/x
  3. Step 3: Cross multiply
    13,120.77x = 18,102.15 × 9,140.43
  4. Step 4: Simplify right side
    13,120.77x = 165,461,434.92
  5. Step 5: Solve for x
    x = 165,461,434.92/13,120.77
  6. Step 6: Final answer
    x = 12,610.65

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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.