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Finding the Fourth Proportional to 407,490.40, 611,408.40 and 257,845.60

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Solution

The fourth proportional to 407,490.40, 611,408.40 and 257,845.60 is: 386,877.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    407,490.40 : 611,408.40 = 257,845.60 : x
  2. Step 2: Convert to fraction form
    407,490.40/611,408.40 = 257,845.60/x
  3. Step 3: Cross multiply
    407,490.40x = 611,408.40 × 257,845.60
  4. Step 4: Simplify right side
    407,490.40x = 157,648,965,743.04
  5. Step 5: Solve for x
    x = 157,648,965,743.04/407,490.40
  6. Step 6: Final answer
    x = 386,877.74

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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.