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Finding the Fourth Proportional to 986.75, 1,479.08 and 498.77

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Solution

The fourth proportional to 986.75, 1,479.08 and 498.77 is: 747.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.75 : 1,479.08 = 498.77 : x
  2. Step 2: Convert to fraction form
    986.75/1,479.08 = 498.77/x
  3. Step 3: Cross multiply
    986.75x = 1,479.08 × 498.77
  4. Step 4: Simplify right side
    986.75x = 737,710.84
  5. Step 5: Solve for x
    x = 737,710.84/986.75
  6. Step 6: Final answer
    x = 747.62

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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.