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Finding the Fourth Proportional to 1,296.95, 1,943.19 and 857.79

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Solution

The fourth proportional to 1,296.95, 1,943.19 and 857.79 is: 1,285.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,296.95 : 1,943.19 = 857.79 : x
  2. Step 2: Convert to fraction form
    1,296.95/1,943.19 = 857.79/x
  3. Step 3: Cross multiply
    1,296.95x = 1,943.19 × 857.79
  4. Step 4: Simplify right side
    1,296.95x = 1,666,848.95
  5. Step 5: Solve for x
    x = 1,666,848.95/1,296.95
  6. Step 6: Final answer
    x = 1,285.21

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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.