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Finding the Fourth Proportional to 405,911.40, 609,039.90 and 256,266.60

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Solution

The fourth proportional to 405,911.40, 609,039.90 and 256,266.60 is: 384,508.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    405,911.40 : 609,039.90 = 256,266.60 : x
  2. Step 2: Convert to fraction form
    405,911.40/609,039.90 = 256,266.60/x
  3. Step 3: Cross multiply
    405,911.40x = 609,039.90 × 256,266.60
  4. Step 4: Simplify right side
    405,911.40x = 156,076,584,437.34
  5. Step 5: Solve for x
    x = 156,076,584,437.34/405,911.40
  6. Step 6: Final answer
    x = 384,508.99

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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.