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Finding the Fourth Proportional to 744.84, 1,120.46 and 621.81

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Solution

The fourth proportional to 744.84, 1,120.46 and 621.81 is: 935.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    744.84 : 1,120.46 = 621.81 : x
  2. Step 2: Convert to fraction form
    744.84/1,120.46 = 621.81/x
  3. Step 3: Cross multiply
    744.84x = 1,120.46 × 621.81
  4. Step 4: Simplify right side
    744.84x = 696,710.12
  5. Step 5: Solve for x
    x = 696,710.12/744.84
  6. Step 6: Final answer
    x = 935.38

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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.