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Finding the Fourth Proportional to 28,878.53, 39,831.04 and 18,257.91

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Solution

The fourth proportional to 28,878.53, 39,831.04 and 18,257.91 is: 25,182.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,878.53 : 39,831.04 = 18,257.91 : x
  2. Step 2: Convert to fraction form
    28,878.53/39,831.04 = 18,257.91/x
  3. Step 3: Cross multiply
    28,878.53x = 39,831.04 × 18,257.91
  4. Step 4: Simplify right side
    28,878.53x = 727,231,416.98
  5. Step 5: Solve for x
    x = 727,231,416.98/28,878.53
  6. Step 6: Final answer
    x = 25,182.43

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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.