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Finding the Fourth Proportional to 789.63, 1,089.63 and 440.25

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Solution

The fourth proportional to 789.63, 1,089.63 and 440.25 is: 607.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    789.63 : 1,089.63 = 440.25 : x
  2. Step 2: Convert to fraction form
    789.63/1,089.63 = 440.25/x
  3. Step 3: Cross multiply
    789.63x = 1,089.63 × 440.25
  4. Step 4: Simplify right side
    789.63x = 479,709.61
  5. Step 5: Solve for x
    x = 479,709.61/789.63
  6. Step 6: Final answer
    x = 607.51

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Double scale
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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.