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Finding the Fourth Proportional to 407.84, 611.76 and 99.69

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Solution

The fourth proportional to 407.84, 611.76 and 99.69 is: 149.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    407.84 : 611.76 = 99.69 : x
  2. Step 2: Convert to fraction form
    407.84/611.76 = 99.69/x
  3. Step 3: Cross multiply
    407.84x = 611.76 × 99.69
  4. Step 4: Simplify right side
    407.84x = 60,986.35
  5. Step 5: Solve for x
    x = 60,986.35/407.84
  6. Step 6: Final answer
    x = 149.54

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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.