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Finding the Fourth Proportional to 962.63, 1,327.55 and 643.04

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Solution

The fourth proportional to 962.63, 1,327.55 and 643.04 is: 886.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    962.63 : 1,327.55 = 643.04 : x
  2. Step 2: Convert to fraction form
    962.63/1,327.55 = 643.04/x
  3. Step 3: Cross multiply
    962.63x = 1,327.55 × 643.04
  4. Step 4: Simplify right side
    962.63x = 853,662.88
  5. Step 5: Solve for x
    x = 853,662.88/962.63
  6. Step 6: Final answer
    x = 886.80

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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.