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Finding the Fourth Proportional to 390,291.37, 538,404.78 and 261,235.33

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Solution

The fourth proportional to 390,291.37, 538,404.78 and 261,235.33 is: 360,372.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,291.37 : 538,404.78 = 261,235.33 : x
  2. Step 2: Convert to fraction form
    390,291.37/538,404.78 = 261,235.33/x
  3. Step 3: Cross multiply
    390,291.37x = 538,404.78 × 261,235.33
  4. Step 4: Simplify right side
    390,291.37x = 140,650,350,376.88
  5. Step 5: Solve for x
    x = 140,650,350,376.88/390,291.37
  6. Step 6: Final answer
    x = 360,372.69

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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.