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Finding the Fourth Proportional to 780.67, 1,075.85 and 559.24

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Solution

The fourth proportional to 780.67, 1,075.85 and 559.24 is: 770.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    780.67 : 1,075.85 = 559.24 : x
  2. Step 2: Convert to fraction form
    780.67/1,075.85 = 559.24/x
  3. Step 3: Cross multiply
    780.67x = 1,075.85 × 559.24
  4. Step 4: Simplify right side
    780.67x = 601,655.56
  5. Step 5: Solve for x
    x = 601,655.56/780.67
  6. Step 6: Final answer
    x = 770.69

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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.