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Finding the Fourth Proportional to 448.42, 672.65 and 123.79

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Solution

The fourth proportional to 448.42, 672.65 and 123.79 is: 185.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    448.42 : 672.65 = 123.79 : x
  2. Step 2: Convert to fraction form
    448.42/672.65 = 123.79/x
  3. Step 3: Cross multiply
    448.42x = 672.65 × 123.79
  4. Step 4: Simplify right side
    448.42x = 83,267.34
  5. Step 5: Solve for x
    x = 83,267.34/448.42
  6. Step 6: Final answer
    x = 185.69

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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.