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Finding the Fourth Proportional to 345.44, 478.78 and 340.32

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Solution

The fourth proportional to 345.44, 478.78 and 340.32 is: 471.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    345.44 : 478.78 = 340.32 : x
  2. Step 2: Convert to fraction form
    345.44/478.78 = 340.32/x
  3. Step 3: Cross multiply
    345.44x = 478.78 × 340.32
  4. Step 4: Simplify right side
    345.44x = 162,938.41
  5. Step 5: Solve for x
    x = 162,938.41/345.44
  6. Step 6: Final answer
    x = 471.68

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.