Home / 642,286.38-885,856.23-438,501.54

Finding the Fourth Proportional to 642,286.38, 885,856.23 and 438,501.54

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Solution

The fourth proportional to 642,286.38, 885,856.23 and 438,501.54 is: 604,791.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    642,286.38 : 885,856.23 = 438,501.54 : x
  2. Step 2: Convert to fraction form
    642,286.38/885,856.23 = 438,501.54/x
  3. Step 3: Cross multiply
    642,286.38x = 885,856.23 × 438,501.54
  4. Step 4: Simplify right side
    642,286.38x = 388,449,321,073.59
  5. Step 5: Solve for x
    x = 388,449,321,073.59/642,286.38
  6. Step 6: Final answer
    x = 604,791.47

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Half scale
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Double scale
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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.