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Finding the Fourth Proportional to 1,005, 1,387.62 and 693.96

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Solution

The fourth proportional to 1,005, 1,387.62 and 693.96 is: 958.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,005 : 1,387.62 = 693.96 : x
  2. Step 2: Convert to fraction form
    1,005/1,387.62 = 693.96/x
  3. Step 3: Cross multiply
    1,005x = 1,387.62 × 693.96
  4. Step 4: Simplify right side
    1,005x = 962,952.78
  5. Step 5: Solve for x
    x = 962,952.78/1,005
  6. Step 6: Final answer
    x = 958.16

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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.