Home / 389,621.60-584,389.20-319,378.40

Finding the Fourth Proportional to 389,621.60, 584,389.20 and 319,378.40

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Solution

The fourth proportional to 389,621.60, 584,389.20 and 319,378.40 is: 479,032.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,621.60 : 584,389.20 = 319,378.40 : x
  2. Step 2: Convert to fraction form
    389,621.60/584,389.20 = 319,378.40/x
  3. Step 3: Cross multiply
    389,621.60x = 584,389.20 × 319,378.40
  4. Step 4: Simplify right side
    389,621.60x = 186,641,287,673.28
  5. Step 5: Solve for x
    x = 186,641,287,673.28/389,621.60
  6. Step 6: Final answer
    x = 479,032.19

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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.