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Finding the Fourth Proportional to 779.42, 1,075.88 and 668.45

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Solution

The fourth proportional to 779.42, 1,075.88 and 668.45 is: 922.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    779.42 : 1,075.88 = 668.45 : x
  2. Step 2: Convert to fraction form
    779.42/1,075.88 = 668.45/x
  3. Step 3: Cross multiply
    779.42x = 1,075.88 × 668.45
  4. Step 4: Simplify right side
    779.42x = 719,176.35
  5. Step 5: Solve for x
    x = 719,176.35/779.42
  6. Step 6: Final answer
    x = 922.70

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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.