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Finding the Fourth Proportional to 789.99, 1,090.08 and 440.70

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Solution

The fourth proportional to 789.99, 1,090.08 and 440.70 is: 608.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    789.99 : 1,090.08 = 440.70 : x
  2. Step 2: Convert to fraction form
    789.99/1,090.08 = 440.70/x
  3. Step 3: Cross multiply
    789.99x = 1,090.08 × 440.70
  4. Step 4: Simplify right side
    789.99x = 480,398.26
  5. Step 5: Solve for x
    x = 480,398.26/789.99
  6. Step 6: Final answer
    x = 608.11

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.