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Finding the Fourth Proportional to 1,000.45, 1,379.94 and 659.58

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Solution

The fourth proportional to 1,000.45, 1,379.94 and 659.58 is: 909.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,000.45 : 1,379.94 = 659.58 : x
  2. Step 2: Convert to fraction form
    1,000.45/1,379.94 = 659.58/x
  3. Step 3: Cross multiply
    1,000.45x = 1,379.94 × 659.58
  4. Step 4: Simplify right side
    1,000.45x = 910,180.83
  5. Step 5: Solve for x
    x = 910,180.83/1,000.45
  6. Step 6: Final answer
    x = 909.77

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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.