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Finding the Fourth Proportional to 448.61, 618.66 and 280.34

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Solution

The fourth proportional to 448.61, 618.66 and 280.34 is: 386.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    448.61 : 618.66 = 280.34 : x
  2. Step 2: Convert to fraction form
    448.61/618.66 = 280.34/x
  3. Step 3: Cross multiply
    448.61x = 618.66 × 280.34
  4. Step 4: Simplify right side
    448.61x = 173,434.37
  5. Step 5: Solve for x
    x = 173,434.37/448.61
  6. Step 6: Final answer
    x = 386.61

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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.