Home / 31,149.06-42,969.36-21,080.91

Finding the Fourth Proportional to 31,149.06, 42,969.36 and 21,080.91

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Solution

The fourth proportional to 31,149.06, 42,969.36 and 21,080.91 is: 29,080.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,149.06 : 42,969.36 = 21,080.91 : x
  2. Step 2: Convert to fraction form
    31,149.06/42,969.36 = 21,080.91/x
  3. Step 3: Cross multiply
    31,149.06x = 42,969.36 × 21,080.91
  4. Step 4: Simplify right side
    31,149.06x = 905,833,210.92
  5. Step 5: Solve for x
    x = 905,833,210.92/31,149.06
  6. Step 6: Final answer
    x = 29,080.60

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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.