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Finding the Fourth Proportional to 765.16, 1,054.36 and 755.08

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Solution

The fourth proportional to 765.16, 1,054.36 and 755.08 is: 1,040.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    765.16 : 1,054.36 = 755.08 : x
  2. Step 2: Convert to fraction form
    765.16/1,054.36 = 755.08/x
  3. Step 3: Cross multiply
    765.16x = 1,054.36 × 755.08
  4. Step 4: Simplify right side
    765.16x = 796,126.15
  5. Step 5: Solve for x
    x = 796,126.15/765.16
  6. Step 6: Final answer
    x = 1,040.47

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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.