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Finding the Fourth Proportional to 986.66, 1,479.75 and 401.50

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Solution

The fourth proportional to 986.66, 1,479.75 and 401.50 is: 602.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.66 : 1,479.75 = 401.50 : x
  2. Step 2: Convert to fraction form
    986.66/1,479.75 = 401.50/x
  3. Step 3: Cross multiply
    986.66x = 1,479.75 × 401.50
  4. Step 4: Simplify right side
    986.66x = 594,119.63
  5. Step 5: Solve for x
    x = 594,119.63/986.66
  6. Step 6: Final answer
    x = 602.15

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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.