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Finding the Fourth Proportional to 777.60, 1,069.20 and 745.20

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Solution

The fourth proportional to 777.60, 1,069.20 and 745.20 is: 1,024.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    777.60 : 1,069.20 = 745.20 : x
  2. Step 2: Convert to fraction form
    777.60/1,069.20 = 745.20/x
  3. Step 3: Cross multiply
    777.60x = 1,069.20 × 745.20
  4. Step 4: Simplify right side
    777.60x = 796,767.84
  5. Step 5: Solve for x
    x = 796,767.84/777.60
  6. Step 6: Final answer
    x = 1,024.65

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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.