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Finding the Fourth Proportional to 738.34, 1,018.90 and 406.78

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Solution

The fourth proportional to 738.34, 1,018.90 and 406.78 is: 561.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    738.34 : 1,018.90 = 406.78 : x
  2. Step 2: Convert to fraction form
    738.34/1,018.90 = 406.78/x
  3. Step 3: Cross multiply
    738.34x = 1,018.90 × 406.78
  4. Step 4: Simplify right side
    738.34x = 414,468.14
  5. Step 5: Solve for x
    x = 414,468.14/738.34
  6. Step 6: Final answer
    x = 561.35

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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.