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Finding the Fourth Proportional to 1,388,844.96, 1,916,660.52 and 815,880.12

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Solution

The fourth proportional to 1,388,844.96, 1,916,660.52 and 815,880.12 is: 1,125,946.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,388,844.96 : 1,916,660.52 = 815,880.12 : x
  2. Step 2: Convert to fraction form
    1,388,844.96/1,916,660.52 = 815,880.12/x
  3. Step 3: Cross multiply
    1,388,844.96x = 1,916,660.52 × 815,880.12
  4. Step 4: Simplify right side
    1,388,844.96x = 1,563,765,215,056.86
  5. Step 5: Solve for x
    x = 1,563,765,215,056.86/1,388,844.96
  6. Step 6: Final answer
    x = 1,125,946.57

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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.