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Finding the Fourth Proportional to 1,276,492.80, 1,914,739.20 and 878,361.60

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Solution

The fourth proportional to 1,276,492.80, 1,914,739.20 and 878,361.60 is: 1,317,542.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,276,492.80 : 1,914,739.20 = 878,361.60 : x
  2. Step 2: Convert to fraction form
    1,276,492.80/1,914,739.20 = 878,361.60/x
  3. Step 3: Cross multiply
    1,276,492.80x = 1,914,739.20 × 878,361.60
  4. Step 4: Simplify right side
    1,276,492.80x = 1,681,833,387,294.72
  5. Step 5: Solve for x
    x = 1,681,833,387,294.72/1,276,492.80
  6. Step 6: Final answer
    x = 1,317,542.40

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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.