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Finding the Fourth Proportional to 564.16, 778.22 and 389.20

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Solution

The fourth proportional to 564.16, 778.22 and 389.20 is: 536.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    564.16 : 778.22 = 389.20 : x
  2. Step 2: Convert to fraction form
    564.16/778.22 = 389.20/x
  3. Step 3: Cross multiply
    564.16x = 778.22 × 389.20
  4. Step 4: Simplify right side
    564.16x = 302,883.22
  5. Step 5: Solve for x
    x = 302,883.22/564.16
  6. Step 6: Final answer
    x = 536.87

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.