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Finding the Fourth Proportional to 2,855.80, 4,283.40 and 776

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Solution

The fourth proportional to 2,855.80, 4,283.40 and 776 is: 1,163.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,855.80 : 4,283.40 = 776 : x
  2. Step 2: Convert to fraction form
    2,855.80/4,283.40 = 776/x
  3. Step 3: Cross multiply
    2,855.80x = 4,283.40 × 776
  4. Step 4: Simplify right side
    2,855.80x = 3,323,918.40
  5. Step 5: Solve for x
    x = 3,323,918.40/2,855.80
  6. Step 6: Final answer
    x = 1,163.92

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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.