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Finding the Fourth Proportional to 28,248.94, 42,538.64 and 20,905.22

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Solution

The fourth proportional to 28,248.94, 42,538.64 and 20,905.22 is: 31,480.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,248.94 : 42,538.64 = 20,905.22 : x
  2. Step 2: Convert to fraction form
    28,248.94/42,538.64 = 20,905.22/x
  3. Step 3: Cross multiply
    28,248.94x = 42,538.64 × 20,905.22
  4. Step 4: Simplify right side
    28,248.94x = 889,279,627.70
  5. Step 5: Solve for x
    x = 889,279,627.70/28,248.94
  6. Step 6: Final answer
    x = 31,480.11

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.