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Finding the Fourth Proportional to 1,374.64, 1,897.11 and 785.35

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Solution

The fourth proportional to 1,374.64, 1,897.11 and 785.35 is: 1,083.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,374.64 : 1,897.11 = 785.35 : x
  2. Step 2: Convert to fraction form
    1,374.64/1,897.11 = 785.35/x
  3. Step 3: Cross multiply
    1,374.64x = 1,897.11 × 785.35
  4. Step 4: Simplify right side
    1,374.64x = 1,489,895.34
  5. Step 5: Solve for x
    x = 1,489,895.34/1,374.64
  6. Step 6: Final answer
    x = 1,083.84

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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.