Home / 13,708.20-18,917.15-7,740.12

Finding the Fourth Proportional to 13,708.20, 18,917.15 and 7,740.12

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Solution

The fourth proportional to 13,708.20, 18,917.15 and 7,740.12 is: 10,681.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,708.20 : 18,917.15 = 7,740.12 : x
  2. Step 2: Convert to fraction form
    13,708.20/18,917.15 = 7,740.12/x
  3. Step 3: Cross multiply
    13,708.20x = 18,917.15 × 7,740.12
  4. Step 4: Simplify right side
    13,708.20x = 146,421,011.06
  5. Step 5: Solve for x
    x = 146,421,011.06/13,708.20
  6. Step 6: Final answer
    x = 10,681.27

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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.