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Finding the Fourth Proportional to 448.64, 621.62 and 438.92

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Solution

The fourth proportional to 448.64, 621.62 and 438.92 is: 608.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    448.64 : 621.62 = 438.92 : x
  2. Step 2: Convert to fraction form
    448.64/621.62 = 438.92/x
  3. Step 3: Cross multiply
    448.64x = 621.62 × 438.92
  4. Step 4: Simplify right side
    448.64x = 272,836.15
  5. Step 5: Solve for x
    x = 272,836.15/448.64
  6. Step 6: Final answer
    x = 608.15

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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.