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Finding the Fourth Proportional to 963.79, 1,329 and 777.08

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Solution

The fourth proportional to 963.79, 1,329 and 777.08 is: 1,071.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    963.79 : 1,329 = 777.08 : x
  2. Step 2: Convert to fraction form
    963.79/1,329 = 777.08/x
  3. Step 3: Cross multiply
    963.79x = 1,329 × 777.08
  4. Step 4: Simplify right side
    963.79x = 1,032,739.32
  5. Step 5: Solve for x
    x = 1,032,739.32/963.79
  6. Step 6: Final answer
    x = 1,071.54

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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.