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Finding the Fourth Proportional to 1,252.15, 1,878.32 and 521.62

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Solution

The fourth proportional to 1,252.15, 1,878.32 and 521.62 is: 782.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,252.15 : 1,878.32 = 521.62 : x
  2. Step 2: Convert to fraction form
    1,252.15/1,878.32 = 521.62/x
  3. Step 3: Cross multiply
    1,252.15x = 1,878.32 × 521.62
  4. Step 4: Simplify right side
    1,252.15x = 979,769.28
  5. Step 5: Solve for x
    x = 979,769.28/1,252.15
  6. Step 6: Final answer
    x = 782.47

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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.