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Finding the Fourth Proportional to 21,008.48, 31,512.72 and 8,528.48

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Solution

The fourth proportional to 21,008.48, 31,512.72 and 8,528.48 is: 12,792.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,008.48 : 31,512.72 = 8,528.48 : x
  2. Step 2: Convert to fraction form
    21,008.48/31,512.72 = 8,528.48/x
  3. Step 3: Cross multiply
    21,008.48x = 31,512.72 × 8,528.48
  4. Step 4: Simplify right side
    21,008.48x = 268,755,602.27
  5. Step 5: Solve for x
    x = 268,755,602.27/21,008.48
  6. Step 6: Final answer
    x = 12,792.72

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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.