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Finding the Fourth Proportional to 389,643.60, 584,422.20 and 319,400.40

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Solution

The fourth proportional to 389,643.60, 584,422.20 and 319,400.40 is: 479,065.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,643.60 : 584,422.20 = 319,400.40 : x
  2. Step 2: Convert to fraction form
    389,643.60/584,422.20 = 319,400.40/x
  3. Step 3: Cross multiply
    389,643.60x = 584,422.20 × 319,400.40
  4. Step 4: Simplify right side
    389,643.60x = 186,664,684,448.88
  5. Step 5: Solve for x
    x = 186,664,684,448.88/389,643.60
  6. Step 6: Final answer
    x = 479,065.19

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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.