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Finding the Fourth Proportional to 999.30, 1,499.70 and 512.10

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Solution

The fourth proportional to 999.30, 1,499.70 and 512.10 is: 768.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    999.30 : 1,499.70 = 512.10 : x
  2. Step 2: Convert to fraction form
    999.30/1,499.70 = 512.10/x
  3. Step 3: Cross multiply
    999.30x = 1,499.70 × 512.10
  4. Step 4: Simplify right side
    999.30x = 767,996.37
  5. Step 5: Solve for x
    x = 767,996.37/999.30
  6. Step 6: Final answer
    x = 768.53

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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.