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Finding the Fourth Proportional to 845.21, 1,263.65 and 716.66

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Solution

The fourth proportional to 845.21, 1,263.65 and 716.66 is: 1,071.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    845.21 : 1,263.65 = 716.66 : x
  2. Step 2: Convert to fraction form
    845.21/1,263.65 = 716.66/x
  3. Step 3: Cross multiply
    845.21x = 1,263.65 × 716.66
  4. Step 4: Simplify right side
    845.21x = 905,597.51
  5. Step 5: Solve for x
    x = 905,597.51/845.21
  6. Step 6: Final answer
    x = 1,071.45

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.