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Finding the Fourth Proportional to 1,271.78, 1,897.91 and 1,264.48

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Solution

The fourth proportional to 1,271.78, 1,897.91 and 1,264.48 is: 1,887.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,271.78 : 1,897.91 = 1,264.48 : x
  2. Step 2: Convert to fraction form
    1,271.78/1,897.91 = 1,264.48/x
  3. Step 3: Cross multiply
    1,271.78x = 1,897.91 × 1,264.48
  4. Step 4: Simplify right side
    1,271.78x = 2,399,862.91
  5. Step 5: Solve for x
    x = 2,399,862.91/1,271.78
  6. Step 6: Final answer
    x = 1,887.01

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.