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Finding the Fourth Proportional to 1,213.98, 1,821.24 and 619.53

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Solution

The fourth proportional to 1,213.98, 1,821.24 and 619.53 is: 929.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,213.98 : 1,821.24 = 619.53 : x
  2. Step 2: Convert to fraction form
    1,213.98/1,821.24 = 619.53/x
  3. Step 3: Cross multiply
    1,213.98x = 1,821.24 × 619.53
  4. Step 4: Simplify right side
    1,213.98x = 1,128,312.82
  5. Step 5: Solve for x
    x = 1,128,312.82/1,213.98
  6. Step 6: Final answer
    x = 929.43

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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.