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Finding the Fourth Proportional to 639,639.80, 882,716.68 and 353,178

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Solution

The fourth proportional to 639,639.80, 882,716.68 and 353,178 is: 487,393.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,639.80 : 882,716.68 = 353,178 : x
  2. Step 2: Convert to fraction form
    639,639.80/882,716.68 = 353,178/x
  3. Step 3: Cross multiply
    639,639.80x = 882,716.68 × 353,178
  4. Step 4: Simplify right side
    639,639.80x = 311,756,111,609.04
  5. Step 5: Solve for x
    x = 311,756,111,609.04/639,639.80
  6. Step 6: Final answer
    x = 487,393.24

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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.