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Finding the Fourth Proportional to 990.95, 1,367.64 and 618.04

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Solution

The fourth proportional to 990.95, 1,367.64 and 618.04 is: 852.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    990.95 : 1,367.64 = 618.04 : x
  2. Step 2: Convert to fraction form
    990.95/1,367.64 = 618.04/x
  3. Step 3: Cross multiply
    990.95x = 1,367.64 × 618.04
  4. Step 4: Simplify right side
    990.95x = 845,252.81
  5. Step 5: Solve for x
    x = 845,252.81/990.95
  6. Step 6: Final answer
    x = 852.98

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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.