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Finding the Fourth Proportional to 564.68, 778.90 and 407.72

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Solution

The fourth proportional to 564.68, 778.90 and 407.72 is: 562.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    564.68 : 778.90 = 407.72 : x
  2. Step 2: Convert to fraction form
    564.68/778.90 = 407.72/x
  3. Step 3: Cross multiply
    564.68x = 778.90 × 407.72
  4. Step 4: Simplify right side
    564.68x = 317,567.17
  5. Step 5: Solve for x
    x = 317,567.17/564.68
  6. Step 6: Final answer
    x = 562.38

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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.