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Finding the Fourth Proportional to 1,349.40, 1,861.44 and 955.76

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Solution

The fourth proportional to 1,349.40, 1,861.44 and 955.76 is: 1,318.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,349.40 : 1,861.44 = 955.76 : x
  2. Step 2: Convert to fraction form
    1,349.40/1,861.44 = 955.76/x
  3. Step 3: Cross multiply
    1,349.40x = 1,861.44 × 955.76
  4. Step 4: Simplify right side
    1,349.40x = 1,779,089.89
  5. Step 5: Solve for x
    x = 1,779,089.89/1,349.40
  6. Step 6: Final answer
    x = 1,318.43

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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.