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Finding the Fourth Proportional to 318,338.42, 439,488.60 and 211,053.77

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Solution

The fourth proportional to 318,338.42, 439,488.60 and 211,053.77 is: 291,374.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,338.42 : 439,488.60 = 211,053.77 : x
  2. Step 2: Convert to fraction form
    318,338.42/439,488.60 = 211,053.77/x
  3. Step 3: Cross multiply
    318,338.42x = 439,488.60 × 211,053.77
  4. Step 4: Simplify right side
    318,338.42x = 92,755,724,561.21
  5. Step 5: Solve for x
    x = 92,755,724,561.21/318,338.42
  6. Step 6: Final answer
    x = 291,374.58

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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.