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Finding the Fourth Proportional to 1,372.18, 1,893.72 and 782.76

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Solution

The fourth proportional to 1,372.18, 1,893.72 and 782.76 is: 1,080.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,372.18 : 1,893.72 = 782.76 : x
  2. Step 2: Convert to fraction form
    1,372.18/1,893.72 = 782.76/x
  3. Step 3: Cross multiply
    1,372.18x = 1,893.72 × 782.76
  4. Step 4: Simplify right side
    1,372.18x = 1,482,324.35
  5. Step 5: Solve for x
    x = 1,482,324.35/1,372.18
  6. Step 6: Final answer
    x = 1,080.27

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1.5x scale

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.