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Finding the Fourth Proportional to 957.90, 1,322.43 and 643.62

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Solution

The fourth proportional to 957.90, 1,322.43 and 643.62 is: 888.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    957.90 : 1,322.43 = 643.62 : x
  2. Step 2: Convert to fraction form
    957.90/1,322.43 = 643.62/x
  3. Step 3: Cross multiply
    957.90x = 1,322.43 × 643.62
  4. Step 4: Simplify right side
    957.90x = 851,142.40
  5. Step 5: Solve for x
    x = 851,142.40/957.90
  6. Step 6: Final answer
    x = 888.55

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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.