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Finding the Fourth Proportional to 408,858.90, 609,092.57 and 390,414.76

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Solution

The fourth proportional to 408,858.90, 609,092.57 and 390,414.76 is: 581,615.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    408,858.90 : 609,092.57 = 390,414.76 : x
  2. Step 2: Convert to fraction form
    408,858.90/609,092.57 = 390,414.76/x
  3. Step 3: Cross multiply
    408,858.90x = 609,092.57 × 390,414.76
  4. Step 4: Simplify right side
    408,858.90x = 237,798,729,534.33
  5. Step 5: Solve for x
    x = 237,798,729,534.33/408,858.90
  6. Step 6: Final answer
    x = 581,615.64

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.