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Finding the Fourth Proportional to 1,838.42, 2,757.80 and 913.06

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Solution

The fourth proportional to 1,838.42, 2,757.80 and 913.06 is: 1,369.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,838.42 : 2,757.80 = 913.06 : x
  2. Step 2: Convert to fraction form
    1,838.42/2,757.80 = 913.06/x
  3. Step 3: Cross multiply
    1,838.42x = 2,757.80 × 913.06
  4. Step 4: Simplify right side
    1,838.42x = 2,518,036.87
  5. Step 5: Solve for x
    x = 2,518,036.87/1,838.42
  6. Step 6: Final answer
    x = 1,369.67

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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.