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Finding the Fourth Proportional to 739.43, 1,020.40 and 407.84

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Solution

The fourth proportional to 739.43, 1,020.40 and 407.84 is: 562.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    739.43 : 1,020.40 = 407.84 : x
  2. Step 2: Convert to fraction form
    739.43/1,020.40 = 407.84/x
  3. Step 3: Cross multiply
    739.43x = 1,020.40 × 407.84
  4. Step 4: Simplify right side
    739.43x = 416,153.81
  5. Step 5: Solve for x
    x = 416,153.81/739.43
  6. Step 6: Final answer
    x = 562.80

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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.