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Finding the Fourth Proportional to 1,913.48, 2,872.88 and 989.72

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Solution

The fourth proportional to 1,913.48, 2,872.88 and 989.72 is: 1,485.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,913.48 : 2,872.88 = 989.72 : x
  2. Step 2: Convert to fraction form
    1,913.48/2,872.88 = 989.72/x
  3. Step 3: Cross multiply
    1,913.48x = 2,872.88 × 989.72
  4. Step 4: Simplify right side
    1,913.48x = 2,843,346.79
  5. Step 5: Solve for x
    x = 2,843,346.79/1,913.48
  6. Step 6: Final answer
    x = 1,485.96

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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.