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Finding the Fourth Proportional to 1,028.84, 1,539.84 and 783.98

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Solution

The fourth proportional to 1,028.84, 1,539.84 and 783.98 is: 1,173.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,028.84 : 1,539.84 = 783.98 : x
  2. Step 2: Convert to fraction form
    1,028.84/1,539.84 = 783.98/x
  3. Step 3: Cross multiply
    1,028.84x = 1,539.84 × 783.98
  4. Step 4: Simplify right side
    1,028.84x = 1,207,203.76
  5. Step 5: Solve for x
    x = 1,207,203.76/1,028.84
  6. Step 6: Final answer
    x = 1,173.36

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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.