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Finding the Fourth Proportional to 1,375.71, 2,059.52 and 912.21

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Solution

The fourth proportional to 1,375.71, 2,059.52 and 912.21 is: 1,365.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,375.71 : 2,059.52 = 912.21 : x
  2. Step 2: Convert to fraction form
    1,375.71/2,059.52 = 912.21/x
  3. Step 3: Cross multiply
    1,375.71x = 2,059.52 × 912.21
  4. Step 4: Simplify right side
    1,375.71x = 1,878,710.18
  5. Step 5: Solve for x
    x = 1,878,710.18/1,375.71
  6. Step 6: Final answer
    x = 1,365.63

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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.