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Finding the Fourth Proportional to 999.13, 1,488.76 and 890.08

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Solution

The fourth proportional to 999.13, 1,488.76 and 890.08 is: 1,326.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    999.13 : 1,488.76 = 890.08 : x
  2. Step 2: Convert to fraction form
    999.13/1,488.76 = 890.08/x
  3. Step 3: Cross multiply
    999.13x = 1,488.76 × 890.08
  4. Step 4: Simplify right side
    999.13x = 1,325,115.50
  5. Step 5: Solve for x
    x = 1,325,115.50/999.13
  6. Step 6: Final answer
    x = 1,326.27

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.