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Finding the Fourth Proportional to 645,138.30, 967,379.40 and 378,980.40

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Solution

The fourth proportional to 645,138.30, 967,379.40 and 378,980.40 is: 568,277.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,138.30 : 967,379.40 = 378,980.40 : x
  2. Step 2: Convert to fraction form
    645,138.30/967,379.40 = 378,980.40/x
  3. Step 3: Cross multiply
    645,138.30x = 967,379.40 × 378,980.40
  4. Step 4: Simplify right side
    645,138.30x = 366,617,831,963.76
  5. Step 5: Solve for x
    x = 366,617,831,963.76/645,138.30
  6. Step 6: Final answer
    x = 568,277.89

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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.