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Finding the Fourth Proportional to 777.68, 1,073.68 and 636.20

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Solution

The fourth proportional to 777.68, 1,073.68 and 636.20 is: 878.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    777.68 : 1,073.68 = 636.20 : x
  2. Step 2: Convert to fraction form
    777.68/1,073.68 = 636.20/x
  3. Step 3: Cross multiply
    777.68x = 1,073.68 × 636.20
  4. Step 4: Simplify right side
    777.68x = 683,075.22
  5. Step 5: Solve for x
    x = 683,075.22/777.68
  6. Step 6: Final answer
    x = 878.35

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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.