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Finding the Fourth Proportional to 738.25, 1,018.79 and 406.70

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Solution

The fourth proportional to 738.25, 1,018.79 and 406.70 is: 561.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    738.25 : 1,018.79 = 406.70 : x
  2. Step 2: Convert to fraction form
    738.25/1,018.79 = 406.70/x
  3. Step 3: Cross multiply
    738.25x = 1,018.79 × 406.70
  4. Step 4: Simplify right side
    738.25x = 414,344.91
  5. Step 5: Solve for x
    x = 414,344.91/738.25
  6. Step 6: Final answer
    x = 561.25

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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.