Home / 389,905.60-584,815.20-319,662.40

Finding the Fourth Proportional to 389,905.60, 584,815.20 and 319,662.40

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Solution

The fourth proportional to 389,905.60, 584,815.20 and 319,662.40 is: 479,458.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,905.60 : 584,815.20 = 319,662.40 : x
  2. Step 2: Convert to fraction form
    389,905.60/584,815.20 = 319,662.40/x
  3. Step 3: Cross multiply
    389,905.60x = 584,815.20 × 319,662.40
  4. Step 4: Simplify right side
    389,905.60x = 186,943,430,388.48
  5. Step 5: Solve for x
    x = 186,943,430,388.48/389,905.60
  6. Step 6: Final answer
    x = 479,458.18

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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.