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Finding the Fourth Proportional to 389,439.60, 584,389.80 and 256,703.60

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Solution

The fourth proportional to 389,439.60, 584,389.80 and 256,703.60 is: 385,207.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,439.60 : 584,389.80 = 256,703.60 : x
  2. Step 2: Convert to fraction form
    389,439.60/584,389.80 = 256,703.60/x
  3. Step 3: Cross multiply
    389,439.60x = 584,389.80 × 256,703.60
  4. Step 4: Simplify right side
    389,439.60x = 150,014,965,463.28
  5. Step 5: Solve for x
    x = 150,014,965,463.28/389,439.60
  6. Step 6: Final answer
    x = 385,207.27

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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.