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Finding the Fourth Proportional to 218,894.70, 328,099.05 and 85,730.70

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Solution

The fourth proportional to 218,894.70, 328,099.05 and 85,730.70 is: 128,500.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,894.70 : 328,099.05 = 85,730.70 : x
  2. Step 2: Convert to fraction form
    218,894.70/328,099.05 = 85,730.70/x
  3. Step 3: Cross multiply
    218,894.70x = 328,099.05 × 85,730.70
  4. Step 4: Simplify right side
    218,894.70x = 28,128,161,225.84
  5. Step 5: Solve for x
    x = 28,128,161,225.84/218,894.70
  6. Step 6: Final answer
    x = 128,500.88

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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.