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Finding the Fourth Proportional to 1,401.36, 1,933.84 and 771.90

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Solution

The fourth proportional to 1,401.36, 1,933.84 and 771.90 is: 1,065.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,401.36 : 1,933.84 = 771.90 : x
  2. Step 2: Convert to fraction form
    1,401.36/1,933.84 = 771.90/x
  3. Step 3: Cross multiply
    1,401.36x = 1,933.84 × 771.90
  4. Step 4: Simplify right side
    1,401.36x = 1,492,731.10
  5. Step 5: Solve for x
    x = 1,492,731.10/1,401.36
  6. Step 6: Final answer
    x = 1,065.20

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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.