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Finding the Fourth Proportional to 1,000.01, 1,379.09 and 663.32

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Solution

The fourth proportional to 1,000.01, 1,379.09 and 663.32 is: 914.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,000.01 : 1,379.09 = 663.32 : x
  2. Step 2: Convert to fraction form
    1,000.01/1,379.09 = 663.32/x
  3. Step 3: Cross multiply
    1,000.01x = 1,379.09 × 663.32
  4. Step 4: Simplify right side
    1,000.01x = 914,774.66
  5. Step 5: Solve for x
    x = 914,774.66/1,000.01
  6. Step 6: Final answer
    x = 914.77

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1.5x scale

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.