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Finding the Fourth Proportional to 1,271.70, 1,907.88 and 540.90

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Solution

The fourth proportional to 1,271.70, 1,907.88 and 540.90 is: 811.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,271.70 : 1,907.88 = 540.90 : x
  2. Step 2: Convert to fraction form
    1,271.70/1,907.88 = 540.90/x
  3. Step 3: Cross multiply
    1,271.70x = 1,907.88 × 540.90
  4. Step 4: Simplify right side
    1,271.70x = 1,031,972.29
  5. Step 5: Solve for x
    x = 1,031,972.29/1,271.70
  6. Step 6: Final answer
    x = 811.49

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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.