Home / 31,151.32-42,973.84-20,391.44

Finding the Fourth Proportional to 31,151.32, 42,973.84 and 20,391.44

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Solution

The fourth proportional to 31,151.32, 42,973.84 and 20,391.44 is: 28,130.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,151.32 : 42,973.84 = 20,391.44 : x
  2. Step 2: Convert to fraction form
    31,151.32/42,973.84 = 20,391.44/x
  3. Step 3: Cross multiply
    31,151.32x = 42,973.84 × 20,391.44
  4. Step 4: Simplify right side
    31,151.32x = 876,298,536.39
  5. Step 5: Solve for x
    x = 876,298,536.39/31,151.32
  6. Step 6: Final answer
    x = 28,130.38

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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.