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Finding the Fourth Proportional to 989.07, 1,366.74 and 957.03

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Solution

The fourth proportional to 989.07, 1,366.74 and 957.03 is: 1,322.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.07 : 1,366.74 = 957.03 : x
  2. Step 2: Convert to fraction form
    989.07/1,366.74 = 957.03/x
  3. Step 3: Cross multiply
    989.07x = 1,366.74 × 957.03
  4. Step 4: Simplify right side
    989.07x = 1,308,011.18
  5. Step 5: Solve for x
    x = 1,308,011.18/989.07
  6. Step 6: Final answer
    x = 1,322.47

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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.