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Finding the Fourth Proportional to 1,215.20, 1,820.06 and 564.56

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Solution

The fourth proportional to 1,215.20, 1,820.06 and 564.56 is: 845.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,215.20 : 1,820.06 = 564.56 : x
  2. Step 2: Convert to fraction form
    1,215.20/1,820.06 = 564.56/x
  3. Step 3: Cross multiply
    1,215.20x = 1,820.06 × 564.56
  4. Step 4: Simplify right side
    1,215.20x = 1,027,533.07
  5. Step 5: Solve for x
    x = 1,027,533.07/1,215.20
  6. Step 6: Final answer
    x = 845.57

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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.