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Finding the Fourth Proportional to 855,121.80, 1,281,880.80 and 323,000.40

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Solution

The fourth proportional to 855,121.80, 1,281,880.80 and 323,000.40 is: 484,197.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    855,121.80 : 1,281,880.80 = 323,000.40 : x
  2. Step 2: Convert to fraction form
    855,121.80/1,281,880.80 = 323,000.40/x
  3. Step 3: Cross multiply
    855,121.80x = 1,281,880.80 × 323,000.40
  4. Step 4: Simplify right side
    855,121.80x = 414,048,011,152.32
  5. Step 5: Solve for x
    x = 414,048,011,152.32/855,121.80
  6. Step 6: Final answer
    x = 484,197.70

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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.