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Finding the Fourth Proportional to 28,963.66, 39,968.76 and 16,388.68

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Solution

The fourth proportional to 28,963.66, 39,968.76 and 16,388.68 is: 22,615.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,963.66 : 39,968.76 = 16,388.68 : x
  2. Step 2: Convert to fraction form
    28,963.66/39,968.76 = 16,388.68/x
  3. Step 3: Cross multiply
    28,963.66x = 39,968.76 × 16,388.68
  4. Step 4: Simplify right side
    28,963.66x = 655,035,217.64
  5. Step 5: Solve for x
    x = 655,035,217.64/28,963.66
  6. Step 6: Final answer
    x = 22,615.76

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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.