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Finding the Fourth Proportional to 1,339.70, 1,851.10 and 1,106.42

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Solution

The fourth proportional to 1,339.70, 1,851.10 and 1,106.42 is: 1,528.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,339.70 : 1,851.10 = 1,106.42 : x
  2. Step 2: Convert to fraction form
    1,339.70/1,851.10 = 1,106.42/x
  3. Step 3: Cross multiply
    1,339.70x = 1,851.10 × 1,106.42
  4. Step 4: Simplify right side
    1,339.70x = 2,048,094.06
  5. Step 5: Solve for x
    x = 2,048,094.06/1,339.70
  6. Step 6: Final answer
    x = 1,528.77

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.