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Finding the Fourth Proportional to 1,428.95, 2,143.40 and 771.14

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Solution

The fourth proportional to 1,428.95, 2,143.40 and 771.14 is: 1,156.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,428.95 : 2,143.40 = 771.14 : x
  2. Step 2: Convert to fraction form
    1,428.95/2,143.40 = 771.14/x
  3. Step 3: Cross multiply
    1,428.95x = 2,143.40 × 771.14
  4. Step 4: Simplify right side
    1,428.95x = 1,652,846.90
  5. Step 5: Solve for x
    x = 1,652,846.90/1,428.95
  6. Step 6: Final answer
    x = 1,156.69

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.