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Finding the Fourth Proportional to 1,261.53, 1,892.40 and 531.45

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Solution

The fourth proportional to 1,261.53, 1,892.40 and 531.45 is: 797.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,261.53 : 1,892.40 = 531.45 : x
  2. Step 2: Convert to fraction form
    1,261.53/1,892.40 = 531.45/x
  3. Step 3: Cross multiply
    1,261.53x = 1,892.40 × 531.45
  4. Step 4: Simplify right side
    1,261.53x = 1,005,715.98
  5. Step 5: Solve for x
    x = 1,005,715.98/1,261.53
  6. Step 6: Final answer
    x = 797.22

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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.