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Finding the Fourth Proportional to 1,375.84, 2,071.20 and 1,256.80

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Solution

The fourth proportional to 1,375.84, 2,071.20 and 1,256.80 is: 1,892.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,375.84 : 2,071.20 = 1,256.80 : x
  2. Step 2: Convert to fraction form
    1,375.84/2,071.20 = 1,256.80/x
  3. Step 3: Cross multiply
    1,375.84x = 2,071.20 × 1,256.80
  4. Step 4: Simplify right side
    1,375.84x = 2,603,084.16
  5. Step 5: Solve for x
    x = 2,603,084.16/1,375.84
  6. Step 6: Final answer
    x = 1,892.00

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.