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Finding the Fourth Proportional to 1,289.56, 1,935.06 and 520.12

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Solution

The fourth proportional to 1,289.56, 1,935.06 and 520.12 is: 780.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,289.56 : 1,935.06 = 520.12 : x
  2. Step 2: Convert to fraction form
    1,289.56/1,935.06 = 520.12/x
  3. Step 3: Cross multiply
    1,289.56x = 1,935.06 × 520.12
  4. Step 4: Simplify right side
    1,289.56x = 1,006,463.41
  5. Step 5: Solve for x
    x = 1,006,463.41/1,289.56
  6. Step 6: Final answer
    x = 780.47

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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.