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Finding the Fourth Proportional to 1,639.98, 2,459.88 and 407.36

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Solution

The fourth proportional to 1,639.98, 2,459.88 and 407.36 is: 611.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,639.98 : 2,459.88 = 407.36 : x
  2. Step 2: Convert to fraction form
    1,639.98/2,459.88 = 407.36/x
  3. Step 3: Cross multiply
    1,639.98x = 2,459.88 × 407.36
  4. Step 4: Simplify right side
    1,639.98x = 1,002,062.87
  5. Step 5: Solve for x
    x = 1,002,062.87/1,639.98
  6. Step 6: Final answer
    x = 611.02

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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.