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Finding the Fourth Proportional to 999.30, 1,498.90 and 268.86

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Solution

The fourth proportional to 999.30, 1,498.90 and 268.86 is: 403.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    999.30 : 1,498.90 = 268.86 : x
  2. Step 2: Convert to fraction form
    999.30/1,498.90 = 268.86/x
  3. Step 3: Cross multiply
    999.30x = 1,498.90 × 268.86
  4. Step 4: Simplify right side
    999.30x = 402,994.25
  5. Step 5: Solve for x
    x = 402,994.25/999.30
  6. Step 6: Final answer
    x = 403.28

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.