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Finding the Fourth Proportional to 963.30, 1,442.55 and 771.30

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Solution

The fourth proportional to 963.30, 1,442.55 and 771.30 is: 1,155.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    963.30 : 1,442.55 = 771.30 : x
  2. Step 2: Convert to fraction form
    963.30/1,442.55 = 771.30/x
  3. Step 3: Cross multiply
    963.30x = 1,442.55 × 771.30
  4. Step 4: Simplify right side
    963.30x = 1,112,638.82
  5. Step 5: Solve for x
    x = 1,112,638.82/963.30
  6. Step 6: Final answer
    x = 1,155.03

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.