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Finding the Fourth Proportional to 438,436.40, 657,654.60 and 389,447.60

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Solution

The fourth proportional to 438,436.40, 657,654.60 and 389,447.60 is: 584,171.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    438,436.40 : 657,654.60 = 389,447.60 : x
  2. Step 2: Convert to fraction form
    438,436.40/657,654.60 = 389,447.60/x
  3. Step 3: Cross multiply
    438,436.40x = 657,654.60 × 389,447.60
  4. Step 4: Simplify right side
    438,436.40x = 256,122,005,598.96
  5. Step 5: Solve for x
    x = 256,122,005,598.96/438,436.40
  6. Step 6: Final answer
    x = 584,171.40

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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.