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Finding the Fourth Proportional to 878,947.20, 1,314,921.60 and 761,918.40

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Solution

The fourth proportional to 878,947.20, 1,314,921.60 and 761,918.40 is: 1,139,844.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    878,947.20 : 1,314,921.60 = 761,918.40 : x
  2. Step 2: Convert to fraction form
    878,947.20/1,314,921.60 = 761,918.40/x
  3. Step 3: Cross multiply
    878,947.20x = 1,314,921.60 × 761,918.40
  4. Step 4: Simplify right side
    878,947.20x = 1,001,862,961,597.44
  5. Step 5: Solve for x
    x = 1,001,862,961,597.44/878,947.20
  6. Step 6: Final answer
    x = 1,139,844.31

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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.