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Finding the Fourth Proportional to 1,189,223, 1,641,128.80 and 645,358.80

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Solution

The fourth proportional to 1,189,223, 1,641,128.80 and 645,358.80 is: 890,595.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,189,223 : 1,641,128.80 = 645,358.80 : x
  2. Step 2: Convert to fraction form
    1,189,223/1,641,128.80 = 645,358.80/x
  3. Step 3: Cross multiply
    1,189,223x = 1,641,128.80 × 645,358.80
  4. Step 4: Simplify right side
    1,189,223x = 1,059,116,913,013.44
  5. Step 5: Solve for x
    x = 1,059,116,913,013.44/1,189,223
  6. Step 6: Final answer
    x = 890,595.72

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.