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Finding the Fourth Proportional to 1,270.70, 1,906.70 and 530.86

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Solution

The fourth proportional to 1,270.70, 1,906.70 and 530.86 is: 796.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,270.70 : 1,906.70 = 530.86 : x
  2. Step 2: Convert to fraction form
    1,270.70/1,906.70 = 530.86/x
  3. Step 3: Cross multiply
    1,270.70x = 1,906.70 × 530.86
  4. Step 4: Simplify right side
    1,270.70x = 1,012,190.76
  5. Step 5: Solve for x
    x = 1,012,190.76/1,270.70
  6. Step 6: Final answer
    x = 796.56

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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.