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Finding the Fourth Proportional to 1,380,946.72, 1,905,433.68 and 872,346.40

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Solution

The fourth proportional to 1,380,946.72, 1,905,433.68 and 872,346.40 is: 1,203,665.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,380,946.72 : 1,905,433.68 = 872,346.40 : x
  2. Step 2: Convert to fraction form
    1,380,946.72/1,905,433.68 = 872,346.40/x
  3. Step 3: Cross multiply
    1,380,946.72x = 1,905,433.68 × 872,346.40
  4. Step 4: Simplify right side
    1,380,946.72x = 1,662,198,211,186.75
  5. Step 5: Solve for x
    x = 1,662,198,211,186.75/1,380,946.72
  6. Step 6: Final answer
    x = 1,203,665.71

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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.