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Finding the Fourth Proportional to 218,621.22, 328,118.75 and 85,594.90

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Solution

The fourth proportional to 218,621.22, 328,118.75 and 85,594.90 is: 128,465.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,621.22 : 328,118.75 = 85,594.90 : x
  2. Step 2: Convert to fraction form
    218,621.22/328,118.75 = 85,594.90/x
  3. Step 3: Cross multiply
    218,621.22x = 328,118.75 × 85,594.90
  4. Step 4: Simplify right side
    218,621.22x = 28,085,291,594.38
  5. Step 5: Solve for x
    x = 28,085,291,594.38/218,621.22
  6. Step 6: Final answer
    x = 128,465.53

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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.