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Finding the Fourth Proportional to 1,114.77, 1,539.08 and 774.71

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Solution

The fourth proportional to 1,114.77, 1,539.08 and 774.71 is: 1,069.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,114.77 : 1,539.08 = 774.71 : x
  2. Step 2: Convert to fraction form
    1,114.77/1,539.08 = 774.71/x
  3. Step 3: Cross multiply
    1,114.77x = 1,539.08 × 774.71
  4. Step 4: Simplify right side
    1,114.77x = 1,192,340.67
  5. Step 5: Solve for x
    x = 1,192,340.67/1,114.77
  6. Step 6: Final answer
    x = 1,069.58

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.