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Finding the Fourth Proportional to 1,191.16, 1,779.17 and 983.80

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Solution

The fourth proportional to 1,191.16, 1,779.17 and 983.80 is: 1,469.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,191.16 : 1,779.17 = 983.80 : x
  2. Step 2: Convert to fraction form
    1,191.16/1,779.17 = 983.80/x
  3. Step 3: Cross multiply
    1,191.16x = 1,779.17 × 983.80
  4. Step 4: Simplify right side
    1,191.16x = 1,750,347.45
  5. Step 5: Solve for x
    x = 1,750,347.45/1,191.16
  6. Step 6: Final answer
    x = 1,469.45

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.