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Finding the Fourth Proportional to 448.63, 618.95 and 282.78

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Solution

The fourth proportional to 448.63, 618.95 and 282.78 is: 390.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    448.63 : 618.95 = 282.78 : x
  2. Step 2: Convert to fraction form
    448.63/618.95 = 282.78/x
  3. Step 3: Cross multiply
    448.63x = 618.95 × 282.78
  4. Step 4: Simplify right side
    448.63x = 175,025.27
  5. Step 5: Solve for x
    x = 175,025.27/448.63
  6. Step 6: Final answer
    x = 390.14

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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.