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Finding the Fourth Proportional to 845.56, 1,263.68 and 779.88

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Solution

The fourth proportional to 845.56, 1,263.68 and 779.88 is: 1,165.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    845.56 : 1,263.68 = 779.88 : x
  2. Step 2: Convert to fraction form
    845.56/1,263.68 = 779.88/x
  3. Step 3: Cross multiply
    845.56x = 1,263.68 × 779.88
  4. Step 4: Simplify right side
    845.56x = 985,518.76
  5. Step 5: Solve for x
    x = 985,518.76/845.56
  6. Step 6: Final answer
    x = 1,165.52

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.