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Finding the Fourth Proportional to 1,375.45, 1,897.93 and 815.94

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Solution

The fourth proportional to 1,375.45, 1,897.93 and 815.94 is: 1,125.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,375.45 : 1,897.93 = 815.94 : x
  2. Step 2: Convert to fraction form
    1,375.45/1,897.93 = 815.94/x
  3. Step 3: Cross multiply
    1,375.45x = 1,897.93 × 815.94
  4. Step 4: Simplify right side
    1,375.45x = 1,548,597.00
  5. Step 5: Solve for x
    x = 1,548,597.00/1,375.45
  6. Step 6: Final answer
    x = 1,125.88

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1.5x scale

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.