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Finding the Fourth Proportional to 999.99, 1,492.35 and 890.64

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Solution

The fourth proportional to 999.99, 1,492.35 and 890.64 is: 1,329.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    999.99 : 1,492.35 = 890.64 : x
  2. Step 2: Convert to fraction form
    999.99/1,492.35 = 890.64/x
  3. Step 3: Cross multiply
    999.99x = 1,492.35 × 890.64
  4. Step 4: Simplify right side
    999.99x = 1,329,143.26
  5. Step 5: Solve for x
    x = 1,329,143.26/999.99
  6. Step 6: Final answer
    x = 1,329.16

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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.