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Finding the Fourth Proportional to 1,252.50, 1,878.44 and 521.67

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Solution

The fourth proportional to 1,252.50, 1,878.44 and 521.67 is: 782.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,252.50 : 1,878.44 = 521.67 : x
  2. Step 2: Convert to fraction form
    1,252.50/1,878.44 = 521.67/x
  3. Step 3: Cross multiply
    1,252.50x = 1,878.44 × 521.67
  4. Step 4: Simplify right side
    1,252.50x = 979,933.16
  5. Step 5: Solve for x
    x = 979,933.16/1,252.50
  6. Step 6: Final answer
    x = 782.38

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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.