Home / 389,619.60-584,386.20-319,376.40

Finding the Fourth Proportional to 389,619.60, 584,386.20 and 319,376.40

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Solution

The fourth proportional to 389,619.60, 584,386.20 and 319,376.40 is: 479,029.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,619.60 : 584,386.20 = 319,376.40 : x
  2. Step 2: Convert to fraction form
    389,619.60/584,386.20 = 319,376.40/x
  3. Step 3: Cross multiply
    389,619.60x = 584,386.20 × 319,376.40
  4. Step 4: Simplify right side
    389,619.60x = 186,639,160,765.68
  5. Step 5: Solve for x
    x = 186,639,160,765.68/389,619.60
  6. Step 6: Final answer
    x = 479,029.19

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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.