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Finding the Fourth Proportional to 1,051.53, 1,449.91 and 861.88

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Solution

The fourth proportional to 1,051.53, 1,449.91 and 861.88 is: 1,188.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,051.53 : 1,449.91 = 861.88 : x
  2. Step 2: Convert to fraction form
    1,051.53/1,449.91 = 861.88/x
  3. Step 3: Cross multiply
    1,051.53x = 1,449.91 × 861.88
  4. Step 4: Simplify right side
    1,051.53x = 1,249,644.12
  5. Step 5: Solve for x
    x = 1,249,644.12/1,051.53
  6. Step 6: Final answer
    x = 1,188.41

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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.