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Finding the Fourth Proportional to 210,645.78, 315,968.61 and 84,342.90

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Solution

The fourth proportional to 210,645.78, 315,968.61 and 84,342.90 is: 126,514.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,645.78 : 315,968.61 = 84,342.90 : x
  2. Step 2: Convert to fraction form
    210,645.78/315,968.61 = 84,342.90/x
  3. Step 3: Cross multiply
    210,645.78x = 315,968.61 × 84,342.90
  4. Step 4: Simplify right side
    210,645.78x = 26,649,708,876.37
  5. Step 5: Solve for x
    x = 26,649,708,876.37/210,645.78
  6. Step 6: Final answer
    x = 126,514.33

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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.