Home / 31,618.76-43,642.98-20,871.48

Finding the Fourth Proportional to 31,618.76, 43,642.98 and 20,871.48

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Solution

The fourth proportional to 31,618.76, 43,642.98 and 20,871.48 is: 28,808.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,618.76 : 43,642.98 = 20,871.48 : x
  2. Step 2: Convert to fraction form
    31,618.76/43,642.98 = 20,871.48/x
  3. Step 3: Cross multiply
    31,618.76x = 43,642.98 × 20,871.48
  4. Step 4: Simplify right side
    31,618.76x = 910,893,479.85
  5. Step 5: Solve for x
    x = 910,893,479.85/31,618.76
  6. Step 6: Final answer
    x = 28,808.64

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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.