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Finding the Fourth Proportional to 1,387,443.78, 1,914,981.08 and 843,464.25

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Solution

The fourth proportional to 1,387,443.78, 1,914,981.08 and 843,464.25 is: 1,164,168.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387,443.78 : 1,914,981.08 = 843,464.25 : x
  2. Step 2: Convert to fraction form
    1,387,443.78/1,914,981.08 = 843,464.25/x
  3. Step 3: Cross multiply
    1,387,443.78x = 1,914,981.08 × 843,464.25
  4. Step 4: Simplify right side
    1,387,443.78x = 1,615,218,076,189.07
  5. Step 5: Solve for x
    x = 1,615,218,076,189.07/1,387,443.78
  6. Step 6: Final answer
    x = 1,164,168.31

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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.