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Finding the Fourth Proportional to 28,472.72, 42,718.22 and 13,682.72

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Solution

The fourth proportional to 28,472.72, 42,718.22 and 13,682.72 is: 20,528.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,472.72 : 42,718.22 = 13,682.72 : x
  2. Step 2: Convert to fraction form
    28,472.72/42,718.22 = 13,682.72/x
  3. Step 3: Cross multiply
    28,472.72x = 42,718.22 × 13,682.72
  4. Step 4: Simplify right side
    28,472.72x = 584,501,161.15
  5. Step 5: Solve for x
    x = 584,501,161.15/28,472.72
  6. Step 6: Final answer
    x = 20,528.47

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.