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Finding the Fourth Proportional to 978,883.90, 1,351,108.08 and 668,911.95

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Solution

The fourth proportional to 978,883.90, 1,351,108.08 and 668,911.95 is: 923,268.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    978,883.90 : 1,351,108.08 = 668,911.95 : x
  2. Step 2: Convert to fraction form
    978,883.90/1,351,108.08 = 668,911.95/x
  3. Step 3: Cross multiply
    978,883.90x = 1,351,108.08 × 668,911.95
  4. Step 4: Simplify right side
    978,883.90x = 903,772,340,515.45
  5. Step 5: Solve for x
    x = 903,772,340,515.45/978,883.90
  6. Step 6: Final answer
    x = 923,268.17

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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.