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Finding the Fourth Proportional to 684.93, 945.20 and 390.25

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Solution

The fourth proportional to 684.93, 945.20 and 390.25 is: 538.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    684.93 : 945.20 = 390.25 : x
  2. Step 2: Convert to fraction form
    684.93/945.20 = 390.25/x
  3. Step 3: Cross multiply
    684.93x = 945.20 × 390.25
  4. Step 4: Simplify right side
    684.93x = 368,864.30
  5. Step 5: Solve for x
    x = 368,864.30/684.93
  6. Step 6: Final answer
    x = 538.54

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