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Finding the Fourth Proportional to 412.78, 618.95 and 181.40

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Solution

The fourth proportional to 412.78, 618.95 and 181.40 is: 272.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    412.78 : 618.95 = 181.40 : x
  2. Step 2: Convert to fraction form
    412.78/618.95 = 181.40/x
  3. Step 3: Cross multiply
    412.78x = 618.95 × 181.40
  4. Step 4: Simplify right side
    412.78x = 112,277.86
  5. Step 5: Solve for x
    x = 112,277.86/412.78
  6. Step 6: Final answer
    x = 272.00

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.