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Finding the Fourth Proportional to 1,340.79, 1,850.94 and 921.90

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Solution

The fourth proportional to 1,340.79, 1,850.94 and 921.90 is: 1,272.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,340.79 : 1,850.94 = 921.90 : x
  2. Step 2: Convert to fraction form
    1,340.79/1,850.94 = 921.90/x
  3. Step 3: Cross multiply
    1,340.79x = 1,850.94 × 921.90
  4. Step 4: Simplify right side
    1,340.79x = 1,706,381.59
  5. Step 5: Solve for x
    x = 1,706,381.59/1,340.79
  6. Step 6: Final answer
    x = 1,272.67

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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.