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Finding the Fourth Proportional to 978,910.64, 1,351,145.00 and 668,938.78

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Solution

The fourth proportional to 978,910.64, 1,351,145.00 and 668,938.78 is: 923,305.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    978,910.64 : 1,351,145.00 = 668,938.78 : x
  2. Step 2: Convert to fraction form
    978,910.64/1,351,145.00 = 668,938.78/x
  3. Step 3: Cross multiply
    978,910.64x = 1,351,145.00 × 668,938.78
  4. Step 4: Simplify right side
    978,910.64x = 903,833,287,464.28
  5. Step 5: Solve for x
    x = 903,833,287,464.28/978,910.64
  6. Step 6: Final answer
    x = 923,305.20

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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.