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Finding the Fourth Proportional to 346.90, 478.15 and 281.29

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Solution

The fourth proportional to 346.90, 478.15 and 281.29 is: 387.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    346.90 : 478.15 = 281.29 : x
  2. Step 2: Convert to fraction form
    346.90/478.15 = 281.29/x
  3. Step 3: Cross multiply
    346.90x = 478.15 × 281.29
  4. Step 4: Simplify right side
    346.90x = 134,498.81
  5. Step 5: Solve for x
    x = 134,498.81/346.90
  6. Step 6: Final answer
    x = 387.72

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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.