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Finding the Fourth Proportional to 900.30, 1,245.05 and 789.55

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Solution

The fourth proportional to 900.30, 1,245.05 and 789.55 is: 1,091.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    900.30 : 1,245.05 = 789.55 : x
  2. Step 2: Convert to fraction form
    900.30/1,245.05 = 789.55/x
  3. Step 3: Cross multiply
    900.30x = 1,245.05 × 789.55
  4. Step 4: Simplify right side
    900.30x = 983,029.23
  5. Step 5: Solve for x
    x = 983,029.23/900.30
  6. Step 6: Final answer
    x = 1,091.89

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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.