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Finding the Fourth Proportional to 641,670.78, 885,494.93 and 355,184.70

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Solution

The fourth proportional to 641,670.78, 885,494.93 and 355,184.70 is: 490,148.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    641,670.78 : 885,494.93 = 355,184.70 : x
  2. Step 2: Convert to fraction form
    641,670.78/885,494.93 = 355,184.70/x
  3. Step 3: Cross multiply
    641,670.78x = 885,494.93 × 355,184.70
  4. Step 4: Simplify right side
    641,670.78x = 314,514,251,063.57
  5. Step 5: Solve for x
    x = 314,514,251,063.57/641,670.78
  6. Step 6: Final answer
    x = 490,148.94

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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.