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Finding the Fourth Proportional to 1,393,361.02, 1,922,684.47 and 781,387.85

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Solution

The fourth proportional to 1,393,361.02, 1,922,684.47 and 781,387.85 is: 1,078,229.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,393,361.02 : 1,922,684.47 = 781,387.85 : x
  2. Step 2: Convert to fraction form
    1,393,361.02/1,922,684.47 = 781,387.85/x
  3. Step 3: Cross multiply
    1,393,361.02x = 1,922,684.47 × 781,387.85
  4. Step 4: Simplify right side
    1,393,361.02x = 1,502,362,272,674.80
  5. Step 5: Solve for x
    x = 1,502,362,272,674.80/1,393,361.02
  6. Step 6: Final answer
    x = 1,078,229.01

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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.