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Finding the Fourth Proportional to 401,338.65, 553,530.31 and 355,446.43

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Solution

The fourth proportional to 401,338.65, 553,530.31 and 355,446.43 is: 490,235.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    401,338.65 : 553,530.31 = 355,446.43 : x
  2. Step 2: Convert to fraction form
    401,338.65/553,530.31 = 355,446.43/x
  3. Step 3: Cross multiply
    401,338.65x = 553,530.31 × 355,446.43
  4. Step 4: Simplify right side
    401,338.65x = 196,750,370,313.85
  5. Step 5: Solve for x
    x = 196,750,370,313.85/401,338.65
  6. Step 6: Final answer
    x = 490,235.29

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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.