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Finding the Fourth Proportional to 1,392.69, 2,088.66 and 405.28

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Solution

The fourth proportional to 1,392.69, 2,088.66 and 405.28 is: 607.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,392.69 : 2,088.66 = 405.28 : x
  2. Step 2: Convert to fraction form
    1,392.69/2,088.66 = 405.28/x
  3. Step 3: Cross multiply
    1,392.69x = 2,088.66 × 405.28
  4. Step 4: Simplify right side
    1,392.69x = 846,489.24
  5. Step 5: Solve for x
    x = 846,489.24/1,392.69
  6. Step 6: Final answer
    x = 607.81

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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.