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Finding the Fourth Proportional to 999.78, 1,499.91 and 383.49

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Solution

The fourth proportional to 999.78, 1,499.91 and 383.49 is: 575.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    999.78 : 1,499.91 = 383.49 : x
  2. Step 2: Convert to fraction form
    999.78/1,499.91 = 383.49/x
  3. Step 3: Cross multiply
    999.78x = 1,499.91 × 383.49
  4. Step 4: Simplify right side
    999.78x = 575,200.49
  5. Step 5: Solve for x
    x = 575,200.49/999.78
  6. Step 6: Final answer
    x = 575.33

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1.5x scale

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.