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Finding the Fourth Proportional to 986.02, 1,478.81 and 437.91

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Solution

The fourth proportional to 986.02, 1,478.81 and 437.91 is: 656.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.02 : 1,478.81 = 437.91 : x
  2. Step 2: Convert to fraction form
    986.02/1,478.81 = 437.91/x
  3. Step 3: Cross multiply
    986.02x = 1,478.81 × 437.91
  4. Step 4: Simplify right side
    986.02x = 647,578.77
  5. Step 5: Solve for x
    x = 647,578.77/986.02
  6. Step 6: Final answer
    x = 656.76

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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.