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Finding the Fourth Proportional to 990.07, 1,368.12 and 958.03

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Solution

The fourth proportional to 990.07, 1,368.12 and 958.03 is: 1,323.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.07 : 1,368.12 = 958.03 : x
  2. Step 2: Convert to fraction form
    990.07/1,368.12 = 958.03/x
  3. Step 3: Cross multiply
    990.07x = 1,368.12 × 958.03
  4. Step 4: Simplify right side
    990.07x = 1,310,700.00
  5. Step 5: Solve for x
    x = 1,310,700.00/990.07
  6. Step 6: Final answer
    x = 1,323.85

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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.