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Finding the Fourth Proportional to 986.99, 1,479.08 and 724.94

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Solution

The fourth proportional to 986.99, 1,479.08 and 724.94 is: 1,086.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    986.99 : 1,479.08 = 724.94 : x
  2. Step 2: Convert to fraction form
    986.99/1,479.08 = 724.94/x
  3. Step 3: Cross multiply
    986.99x = 1,479.08 × 724.94
  4. Step 4: Simplify right side
    986.99x = 1,072,238.75
  5. Step 5: Solve for x
    x = 1,072,238.75/986.99
  6. Step 6: Final answer
    x = 1,086.37

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1.5x scale

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.