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Finding the Fourth Proportional to 20,640.32, 28,505.22 and 17,068.22

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Solution

The fourth proportional to 20,640.32, 28,505.22 and 17,068.22 is: 23,571.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,640.32 : 28,505.22 = 17,068.22 : x
  2. Step 2: Convert to fraction form
    20,640.32/28,505.22 = 17,068.22/x
  3. Step 3: Cross multiply
    20,640.32x = 28,505.22 × 17,068.22
  4. Step 4: Simplify right side
    20,640.32x = 486,533,366.11
  5. Step 5: Solve for x
    x = 486,533,366.11/20,640.32
  6. Step 6: Final answer
    x = 23,571.99

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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.