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Finding the Fourth Proportional to 413,979.60, 620,969.40 and 389,485.20

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Solution

The fourth proportional to 413,979.60, 620,969.40 and 389,485.20 is: 584,227.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    413,979.60 : 620,969.40 = 389,485.20 : x
  2. Step 2: Convert to fraction form
    413,979.60/620,969.40 = 389,485.20/x
  3. Step 3: Cross multiply
    413,979.60x = 620,969.40 × 389,485.20
  4. Step 4: Simplify right side
    413,979.60x = 241,858,390,952.88
  5. Step 5: Solve for x
    x = 241,858,390,952.88/413,979.60
  6. Step 6: Final answer
    x = 584,227.80

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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.