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Finding the Fourth Proportional to 967.40, 1,451.42 and 643.56

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Solution

The fourth proportional to 967.40, 1,451.42 and 643.56 is: 965.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    967.40 : 1,451.42 = 643.56 : x
  2. Step 2: Convert to fraction form
    967.40/1,451.42 = 643.56/x
  3. Step 3: Cross multiply
    967.40x = 1,451.42 × 643.56
  4. Step 4: Simplify right side
    967.40x = 934,075.86
  5. Step 5: Solve for x
    x = 934,075.86/967.40
  6. Step 6: Final answer
    x = 965.55

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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.