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Finding the Fourth Proportional to 218,620.47, 328,117.63 and 85,594.15

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Solution

The fourth proportional to 218,620.47, 328,117.63 and 85,594.15 is: 128,464.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,620.47 : 328,117.63 = 85,594.15 : x
  2. Step 2: Convert to fraction form
    218,620.47/328,117.63 = 85,594.15/x
  3. Step 3: Cross multiply
    218,620.47x = 328,117.63 × 85,594.15
  4. Step 4: Simplify right side
    218,620.47x = 28,084,947,571.31
  5. Step 5: Solve for x
    x = 28,084,947,571.31/218,620.47
  6. Step 6: Final answer
    x = 128,464.40

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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.