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Finding the Fourth Proportional to 955.56, 1,319.04 and 930.72

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Solution

The fourth proportional to 955.56, 1,319.04 and 930.72 is: 1,284.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    955.56 : 1,319.04 = 930.72 : x
  2. Step 2: Convert to fraction form
    955.56/1,319.04 = 930.72/x
  3. Step 3: Cross multiply
    955.56x = 1,319.04 × 930.72
  4. Step 4: Simplify right side
    955.56x = 1,227,656.91
  5. Step 5: Solve for x
    x = 1,227,656.91/955.56
  6. Step 6: Final answer
    x = 1,284.75

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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.