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Finding the Fourth Proportional to 499,640.05, 689,728.44 and 318,595.33

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Solution

The fourth proportional to 499,640.05, 689,728.44 and 318,595.33 is: 439,805.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    499,640.05 : 689,728.44 = 318,595.33 : x
  2. Step 2: Convert to fraction form
    499,640.05/689,728.44 = 318,595.33/x
  3. Step 3: Cross multiply
    499,640.05x = 689,728.44 × 318,595.33
  4. Step 4: Simplify right side
    499,640.05x = 219,744,259,952.19
  5. Step 5: Solve for x
    x = 219,744,259,952.19/499,640.05
  6. Step 6: Final answer
    x = 439,805.14

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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.