Home / 28,971.76-39,981.02-15,723.76

Finding the Fourth Proportional to 28,971.76, 39,981.02 and 15,723.76

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Solution

The fourth proportional to 28,971.76, 39,981.02 and 15,723.76 is: 21,698.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,971.76 : 39,981.02 = 15,723.76 : x
  2. Step 2: Convert to fraction form
    28,971.76/39,981.02 = 15,723.76/x
  3. Step 3: Cross multiply
    28,971.76x = 39,981.02 × 15,723.76
  4. Step 4: Simplify right side
    28,971.76x = 628,651,963.04
  5. Step 5: Solve for x
    x = 628,651,963.04/28,971.76
  6. Step 6: Final answer
    x = 21,698.78

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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.