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Finding the Fourth Proportional to 426,778.52, 640,339.91 and 189,959.23

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Solution

The fourth proportional to 426,778.52, 640,339.91 and 189,959.23 is: 285,015.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,778.52 : 640,339.91 = 189,959.23 : x
  2. Step 2: Convert to fraction form
    426,778.52/640,339.91 = 189,959.23/x
  3. Step 3: Cross multiply
    426,778.52x = 640,339.91 × 189,959.23
  4. Step 4: Simplify right side
    426,778.52x = 121,638,472,090.37
  5. Step 5: Solve for x
    x = 121,638,472,090.37/426,778.52
  6. Step 6: Final answer
    x = 285,015.45

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.