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Finding the Fourth Proportional to 813.01, 1,121.95 and 439.99

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Solution

The fourth proportional to 813.01, 1,121.95 and 439.99 is: 607.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    813.01 : 1,121.95 = 439.99 : x
  2. Step 2: Convert to fraction form
    813.01/1,121.95 = 439.99/x
  3. Step 3: Cross multiply
    813.01x = 1,121.95 × 439.99
  4. Step 4: Simplify right side
    813.01x = 493,652.41
  5. Step 5: Solve for x
    x = 493,652.41/813.01
  6. Step 6: Final answer
    x = 607.19

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.