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Finding the Fourth Proportional to 1,913.79, 2,868.39 and 989.76

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Solution

The fourth proportional to 1,913.79, 2,868.39 and 989.76 is: 1,483.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,913.79 : 2,868.39 = 989.76 : x
  2. Step 2: Convert to fraction form
    1,913.79/2,868.39 = 989.76/x
  3. Step 3: Cross multiply
    1,913.79x = 2,868.39 × 989.76
  4. Step 4: Simplify right side
    1,913.79x = 2,839,017.69
  5. Step 5: Solve for x
    x = 2,839,017.69/1,913.79
  6. Step 6: Final answer
    x = 1,483.45

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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.