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Finding the Fourth Proportional to 567.38, 783.60 and 390.81

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Solution

The fourth proportional to 567.38, 783.60 and 390.81 is: 539.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    567.38 : 783.60 = 390.81 : x
  2. Step 2: Convert to fraction form
    567.38/783.60 = 390.81/x
  3. Step 3: Cross multiply
    567.38x = 783.60 × 390.81
  4. Step 4: Simplify right side
    567.38x = 306,238.72
  5. Step 5: Solve for x
    x = 306,238.72/567.38
  6. Step 6: Final answer
    x = 539.75

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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.