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Finding the Fourth Proportional to 1,261.20, 1,892.54 and 530.72

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Solution

The fourth proportional to 1,261.20, 1,892.54 and 530.72 is: 796.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,261.20 : 1,892.54 = 530.72 : x
  2. Step 2: Convert to fraction form
    1,261.20/1,892.54 = 530.72/x
  3. Step 3: Cross multiply
    1,261.20x = 1,892.54 × 530.72
  4. Step 4: Simplify right side
    1,261.20x = 1,004,396.71
  5. Step 5: Solve for x
    x = 1,004,396.71/1,261.20
  6. Step 6: Final answer
    x = 796.38

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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.