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Finding the Fourth Proportional to 567.21, 782.81 and 318.54

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Solution

The fourth proportional to 567.21, 782.81 and 318.54 is: 439.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    567.21 : 782.81 = 318.54 : x
  2. Step 2: Convert to fraction form
    567.21/782.81 = 318.54/x
  3. Step 3: Cross multiply
    567.21x = 782.81 × 318.54
  4. Step 4: Simplify right side
    567.21x = 249,356.30
  5. Step 5: Solve for x
    x = 249,356.30/567.21
  6. Step 6: Final answer
    x = 439.62

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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.