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Finding the Fourth Proportional to 1,271.19, 1,905.57 and 578.25

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Solution

The fourth proportional to 1,271.19, 1,905.57 and 578.25 is: 866.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,271.19 : 1,905.57 = 578.25 : x
  2. Step 2: Convert to fraction form
    1,271.19/1,905.57 = 578.25/x
  3. Step 3: Cross multiply
    1,271.19x = 1,905.57 × 578.25
  4. Step 4: Simplify right side
    1,271.19x = 1,101,895.85
  5. Step 5: Solve for x
    x = 1,101,895.85/1,271.19
  6. Step 6: Final answer
    x = 866.82

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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.