Home / 31,137.12-42,969.48-16,990.20

Finding the Fourth Proportional to 31,137.12, 42,969.48 and 16,990.20

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Solution

The fourth proportional to 31,137.12, 42,969.48 and 16,990.20 is: 23,446.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,137.12 : 42,969.48 = 16,990.20 : x
  2. Step 2: Convert to fraction form
    31,137.12/42,969.48 = 16,990.20/x
  3. Step 3: Cross multiply
    31,137.12x = 42,969.48 × 16,990.20
  4. Step 4: Simplify right side
    31,137.12x = 730,060,059.10
  5. Step 5: Solve for x
    x = 730,060,059.10/31,137.12
  6. Step 6: Final answer
    x = 23,446.61

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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.