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Finding the Fourth Proportional to 345.81, 477.12 and 240.78

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Solution

The fourth proportional to 345.81, 477.12 and 240.78 is: 332.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    345.81 : 477.12 = 240.78 : x
  2. Step 2: Convert to fraction form
    345.81/477.12 = 240.78/x
  3. Step 3: Cross multiply
    345.81x = 477.12 × 240.78
  4. Step 4: Simplify right side
    345.81x = 114,880.95
  5. Step 5: Solve for x
    x = 114,880.95/345.81
  6. Step 6: Final answer
    x = 332.21

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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.