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Finding the Fourth Proportional to 1,342.05, 2,011.83 and 520.86

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Solution

The fourth proportional to 1,342.05, 2,011.83 and 520.86 is: 780.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,342.05 : 2,011.83 = 520.86 : x
  2. Step 2: Convert to fraction form
    1,342.05/2,011.83 = 520.86/x
  3. Step 3: Cross multiply
    1,342.05x = 2,011.83 × 520.86
  4. Step 4: Simplify right side
    1,342.05x = 1,047,881.77
  5. Step 5: Solve for x
    x = 1,047,881.77/1,342.05
  6. Step 6: Final answer
    x = 780.81

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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.