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Finding the Fourth Proportional to 213,725.60, 320,703.60 and 89,079.20

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Solution

The fourth proportional to 213,725.60, 320,703.60 and 89,079.20 is: 133,666.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    213,725.60 : 320,703.60 = 89,079.20 : x
  2. Step 2: Convert to fraction form
    213,725.60/320,703.60 = 89,079.20/x
  3. Step 3: Cross multiply
    213,725.60x = 320,703.60 × 89,079.20
  4. Step 4: Simplify right side
    213,725.60x = 28,568,020,125.12
  5. Step 5: Solve for x
    x = 28,568,020,125.12/213,725.60
  6. Step 6: Final answer
    x = 133,666.81

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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.