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Finding the Fourth Proportional to 780.37, 1,075.82 and 543.97

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Solution

The fourth proportional to 780.37, 1,075.82 and 543.97 is: 749.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    780.37 : 1,075.82 = 543.97 : x
  2. Step 2: Convert to fraction form
    780.37/1,075.82 = 543.97/x
  3. Step 3: Cross multiply
    780.37x = 1,075.82 × 543.97
  4. Step 4: Simplify right side
    780.37x = 585,215.49
  5. Step 5: Solve for x
    x = 585,215.49/780.37
  6. Step 6: Final answer
    x = 749.92

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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.