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Finding the Fourth Proportional to 28,356.96, 42,495.12 and 20,902.80

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Solution

The fourth proportional to 28,356.96, 42,495.12 and 20,902.80 is: 31,324.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,356.96 : 42,495.12 = 20,902.80 : x
  2. Step 2: Convert to fraction form
    28,356.96/42,495.12 = 20,902.80/x
  3. Step 3: Cross multiply
    28,356.96x = 42,495.12 × 20,902.80
  4. Step 4: Simplify right side
    28,356.96x = 888,266,994.34
  5. Step 5: Solve for x
    x = 888,266,994.34/28,356.96
  6. Step 6: Final answer
    x = 31,324.48

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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.