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Finding the Fourth Proportional to 386,307.82, 579,621.16 and 208,605.56

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Solution

The fourth proportional to 386,307.82, 579,621.16 and 208,605.56 is: 312,994.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    386,307.82 : 579,621.16 = 208,605.56 : x
  2. Step 2: Convert to fraction form
    386,307.82/579,621.16 = 208,605.56/x
  3. Step 3: Cross multiply
    386,307.82x = 579,621.16 × 208,605.56
  4. Step 4: Simplify right side
    386,307.82x = 120,912,198,379.46
  5. Step 5: Solve for x
    x = 120,912,198,379.46/386,307.82
  6. Step 6: Final answer
    x = 312,994.44

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.