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Finding the Fourth Proportional to 393.13, 542.12 and 340.65

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Solution

The fourth proportional to 393.13, 542.12 and 340.65 is: 469.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.13 : 542.12 = 340.65 : x
  2. Step 2: Convert to fraction form
    393.13/542.12 = 340.65/x
  3. Step 3: Cross multiply
    393.13x = 542.12 × 340.65
  4. Step 4: Simplify right side
    393.13x = 184,673.18
  5. Step 5: Solve for x
    x = 184,673.18/393.13
  6. Step 6: Final answer
    x = 469.75

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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.