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Finding the Fourth Proportional to 641,678.28, 885,505.28 and 355,192.20

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Solution

The fourth proportional to 641,678.28, 885,505.28 and 355,192.20 is: 490,159.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    641,678.28 : 885,505.28 = 355,192.20 : x
  2. Step 2: Convert to fraction form
    641,678.28/885,505.28 = 355,192.20/x
  3. Step 3: Cross multiply
    641,678.28x = 885,505.28 × 355,192.20
  4. Step 4: Simplify right side
    641,678.28x = 314,524,568,514.82
  5. Step 5: Solve for x
    x = 314,524,568,514.82/641,678.28
  6. Step 6: Final answer
    x = 490,159.29

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1.5x scale

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.