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Finding the Fourth Proportional to 963.42, 1,445.40 and 415.50

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Solution

The fourth proportional to 963.42, 1,445.40 and 415.50 is: 623.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    963.42 : 1,445.40 = 415.50 : x
  2. Step 2: Convert to fraction form
    963.42/1,445.40 = 415.50/x
  3. Step 3: Cross multiply
    963.42x = 1,445.40 × 415.50
  4. Step 4: Simplify right side
    963.42x = 600,563.70
  5. Step 5: Solve for x
    x = 600,563.70/963.42
  6. Step 6: Final answer
    x = 623.37

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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.