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Finding the Fourth Proportional to 1,851.95, 2,778.20 and 553.25

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Solution

The fourth proportional to 1,851.95, 2,778.20 and 553.25 is: 829.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,851.95 : 2,778.20 = 553.25 : x
  2. Step 2: Convert to fraction form
    1,851.95/2,778.20 = 553.25/x
  3. Step 3: Cross multiply
    1,851.95x = 2,778.20 × 553.25
  4. Step 4: Simplify right side
    1,851.95x = 1,537,022.49
  5. Step 5: Solve for x
    x = 1,537,022.49/1,851.95
  6. Step 6: Final answer
    x = 829.95

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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.