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Finding the Fourth Proportional to 986.15, 1,478.68 and 620.16

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Solution

The fourth proportional to 986.15, 1,478.68 and 620.16 is: 929.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.15 : 1,478.68 = 620.16 : x
  2. Step 2: Convert to fraction form
    986.15/1,478.68 = 620.16/x
  3. Step 3: Cross multiply
    986.15x = 1,478.68 × 620.16
  4. Step 4: Simplify right side
    986.15x = 917,012.84
  5. Step 5: Solve for x
    x = 917,012.84/986.15
  6. Step 6: Final answer
    x = 929.89

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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.