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Finding the Fourth Proportional to 986.68, 1,479.99 and 401.67

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Solution

The fourth proportional to 986.68, 1,479.99 and 401.67 is: 602.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.68 : 1,479.99 = 401.67 : x
  2. Step 2: Convert to fraction form
    986.68/1,479.99 = 401.67/x
  3. Step 3: Cross multiply
    986.68x = 1,479.99 × 401.67
  4. Step 4: Simplify right side
    986.68x = 594,470.94
  5. Step 5: Solve for x
    x = 594,470.94/986.68
  6. Step 6: Final answer
    x = 602.50

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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.