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Finding the Fourth Proportional to 1,355.07, 2,031.72 and 891.44

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Solution

The fourth proportional to 1,355.07, 2,031.72 and 891.44 is: 1,336.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,355.07 : 2,031.72 = 891.44 : x
  2. Step 2: Convert to fraction form
    1,355.07/2,031.72 = 891.44/x
  3. Step 3: Cross multiply
    1,355.07x = 2,031.72 × 891.44
  4. Step 4: Simplify right side
    1,355.07x = 1,811,156.48
  5. Step 5: Solve for x
    x = 1,811,156.48/1,355.07
  6. Step 6: Final answer
    x = 1,336.58

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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.