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Finding the Fourth Proportional to 389,611.20, 584,416.80 and 256,641.60

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Solution

The fourth proportional to 389,611.20, 584,416.80 and 256,641.60 is: 384,962.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,611.20 : 584,416.80 = 256,641.60 : x
  2. Step 2: Convert to fraction form
    389,611.20/584,416.80 = 256,641.60/x
  3. Step 3: Cross multiply
    389,611.20x = 584,416.80 × 256,641.60
  4. Step 4: Simplify right side
    389,611.20x = 149,985,662,618.88
  5. Step 5: Solve for x
    x = 149,985,662,618.88/389,611.20
  6. Step 6: Final answer
    x = 384,962.40

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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.