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Finding the Fourth Proportional to 1,372.19, 1,893.62 and 782.91

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Solution

The fourth proportional to 1,372.19, 1,893.62 and 782.91 is: 1,080.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,372.19 : 1,893.62 = 782.91 : x
  2. Step 2: Convert to fraction form
    1,372.19/1,893.62 = 782.91/x
  3. Step 3: Cross multiply
    1,372.19x = 1,893.62 × 782.91
  4. Step 4: Simplify right side
    1,372.19x = 1,482,538.77
  5. Step 5: Solve for x
    x = 1,482,538.77/1,372.19
  6. Step 6: Final answer
    x = 1,080.42

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.