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Finding the Fourth Proportional to 203,780.65, 305,572.66 and 85,420.21

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Solution

The fourth proportional to 203,780.65, 305,572.66 and 85,420.21 is: 128,089.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    203,780.65 : 305,572.66 = 85,420.21 : x
  2. Step 2: Convert to fraction form
    203,780.65/305,572.66 = 85,420.21/x
  3. Step 3: Cross multiply
    203,780.65x = 305,572.66 × 85,420.21
  4. Step 4: Simplify right side
    203,780.65x = 26,102,079,809.98
  5. Step 5: Solve for x
    x = 26,102,079,809.98/203,780.65
  6. Step 6: Final answer
    x = 128,089.10

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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.