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Finding the Fourth Proportional to 1,271.51, 1,906.61 and 577.85

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Solution

The fourth proportional to 1,271.51, 1,906.61 and 577.85 is: 866.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,271.51 : 1,906.61 = 577.85 : x
  2. Step 2: Convert to fraction form
    1,271.51/1,906.61 = 577.85/x
  3. Step 3: Cross multiply
    1,271.51x = 1,906.61 × 577.85
  4. Step 4: Simplify right side
    1,271.51x = 1,101,722.17
  5. Step 5: Solve for x
    x = 1,101,722.17/1,271.51
  6. Step 6: Final answer
    x = 866.47

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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.