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Finding the Fourth Proportional to 1,372.63, 1,894.26 and 783.15

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Solution

The fourth proportional to 1,372.63, 1,894.26 and 783.15 is: 1,080.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,372.63 : 1,894.26 = 783.15 : x
  2. Step 2: Convert to fraction form
    1,372.63/1,894.26 = 783.15/x
  3. Step 3: Cross multiply
    1,372.63x = 1,894.26 × 783.15
  4. Step 4: Simplify right side
    1,372.63x = 1,483,494.00
  5. Step 5: Solve for x
    x = 1,483,494.00/1,372.63
  6. Step 6: Final answer
    x = 1,080.77

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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.