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Finding the Fourth Proportional to 499,992.71, 689,338.52 and 318,638.48

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Solution

The fourth proportional to 499,992.71, 689,338.52 and 318,638.48 is: 439,305.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    499,992.71 : 689,338.52 = 318,638.48 : x
  2. Step 2: Convert to fraction form
    499,992.71/689,338.52 = 318,638.48/x
  3. Step 3: Cross multiply
    499,992.71x = 689,338.52 × 318,638.48
  4. Step 4: Simplify right side
    499,992.71x = 219,649,773,178.37
  5. Step 5: Solve for x
    x = 219,649,773,178.37/499,992.71
  6. Step 6: Final answer
    x = 439,305.96

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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.