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Finding the Fourth Proportional to 1,913.85, 2,868.68 and 988.19

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Solution

The fourth proportional to 1,913.85, 2,868.68 and 988.19 is: 1,481.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,913.85 : 2,868.68 = 988.19 : x
  2. Step 2: Convert to fraction form
    1,913.85/2,868.68 = 988.19/x
  3. Step 3: Cross multiply
    1,913.85x = 2,868.68 × 988.19
  4. Step 4: Simplify right side
    1,913.85x = 2,834,810.53
  5. Step 5: Solve for x
    x = 2,834,810.53/1,913.85
  6. Step 6: Final answer
    x = 1,481.21

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.