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Finding the Fourth Proportional to 890.47, 1,228.64 and 772.26

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Solution

The fourth proportional to 890.47, 1,228.64 and 772.26 is: 1,065.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.47 : 1,228.64 = 772.26 : x
  2. Step 2: Convert to fraction form
    890.47/1,228.64 = 772.26/x
  3. Step 3: Cross multiply
    890.47x = 1,228.64 × 772.26
  4. Step 4: Simplify right side
    890.47x = 948,829.53
  5. Step 5: Solve for x
    x = 948,829.53/890.47
  6. Step 6: Final answer
    x = 1,065.54

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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.