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Finding the Fourth Proportional to 499,647.36, 689,319.72 and 318,326.83

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Solution

The fourth proportional to 499,647.36, 689,319.72 and 318,326.83 is: 439,167.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    499,647.36 : 689,319.72 = 318,326.83 : x
  2. Step 2: Convert to fraction form
    499,647.36/689,319.72 = 318,326.83/x
  3. Step 3: Cross multiply
    499,647.36x = 689,319.72 × 318,326.83
  4. Step 4: Simplify right side
    499,647.36x = 219,428,961,324.09
  5. Step 5: Solve for x
    x = 219,428,961,324.09/499,647.36
  6. Step 6: Final answer
    x = 439,167.66

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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.