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Finding the Fourth Proportional to 993.09, 1,368.84 and 912.63

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Solution

The fourth proportional to 993.09, 1,368.84 and 912.63 is: 1,257.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    993.09 : 1,368.84 = 912.63 : x
  2. Step 2: Convert to fraction form
    993.09/1,368.84 = 912.63/x
  3. Step 3: Cross multiply
    993.09x = 1,368.84 × 912.63
  4. Step 4: Simplify right side
    993.09x = 1,249,244.45
  5. Step 5: Solve for x
    x = 1,249,244.45/993.09
  6. Step 6: Final answer
    x = 1,257.94

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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.