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Finding the Fourth Proportional to 390,290.37, 538,403.40 and 261,234.33

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Solution

The fourth proportional to 390,290.37, 538,403.40 and 261,234.33 is: 360,371.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,290.37 : 538,403.40 = 261,234.33 : x
  2. Step 2: Convert to fraction form
    390,290.37/538,403.40 = 261,234.33/x
  3. Step 3: Cross multiply
    390,290.37x = 538,403.40 × 261,234.33
  4. Step 4: Simplify right side
    390,290.37x = 140,649,451,468.72
  5. Step 5: Solve for x
    x = 140,649,451,468.72/390,290.37
  6. Step 6: Final answer
    x = 360,371.31

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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.