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Finding the Fourth Proportional to 986.17, 1,478.43 and 465.91

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Solution

The fourth proportional to 986.17, 1,478.43 and 465.91 is: 698.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.17 : 1,478.43 = 465.91 : x
  2. Step 2: Convert to fraction form
    986.17/1,478.43 = 465.91/x
  3. Step 3: Cross multiply
    986.17x = 1,478.43 × 465.91
  4. Step 4: Simplify right side
    986.17x = 688,815.32
  5. Step 5: Solve for x
    x = 688,815.32/986.17
  6. Step 6: Final answer
    x = 698.48

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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.