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Finding the Fourth Proportional to 737.98, 1,018.40 and 406.40

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Solution

The fourth proportional to 737.98, 1,018.40 and 406.40 is: 560.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    737.98 : 1,018.40 = 406.40 : x
  2. Step 2: Convert to fraction form
    737.98/1,018.40 = 406.40/x
  3. Step 3: Cross multiply
    737.98x = 1,018.40 × 406.40
  4. Step 4: Simplify right side
    737.98x = 413,870.64
  5. Step 5: Solve for x
    x = 413,870.64/737.98
  6. Step 6: Final answer
    x = 560.82

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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.