Home / 21,159.47-31,740.80-7,119.54

Finding the Fourth Proportional to 21,159.47, 31,740.80 and 7,119.54

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Solution

The fourth proportional to 21,159.47, 31,740.80 and 7,119.54 is: 10,679.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,159.47 : 31,740.80 = 7,119.54 : x
  2. Step 2: Convert to fraction form
    21,159.47/31,740.80 = 7,119.54/x
  3. Step 3: Cross multiply
    21,159.47x = 31,740.80 × 7,119.54
  4. Step 4: Simplify right side
    21,159.47x = 225,979,859.63
  5. Step 5: Solve for x
    x = 225,979,859.63/21,159.47
  6. Step 6: Final answer
    x = 10,679.85

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.