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Finding the Fourth Proportional to 219,019.70, 328,286.55 and 85,855.70

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Solution

The fourth proportional to 219,019.70, 328,286.55 and 85,855.70 is: 128,688.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    219,019.70 : 328,286.55 = 85,855.70 : x
  2. Step 2: Convert to fraction form
    219,019.70/328,286.55 = 85,855.70/x
  3. Step 3: Cross multiply
    219,019.70x = 328,286.55 × 85,855.70
  4. Step 4: Simplify right side
    219,019.70x = 28,185,271,550.84
  5. Step 5: Solve for x
    x = 28,185,271,550.84/219,019.70
  6. Step 6: Final answer
    x = 128,688.29

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1.5x scale

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.