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Finding the Fourth Proportional to 899.07, 1,240.05 and 619.39

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Solution

The fourth proportional to 899.07, 1,240.05 and 619.39 is: 854.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    899.07 : 1,240.05 = 619.39 : x
  2. Step 2: Convert to fraction form
    899.07/1,240.05 = 619.39/x
  3. Step 3: Cross multiply
    899.07x = 1,240.05 × 619.39
  4. Step 4: Simplify right side
    899.07x = 768,074.57
  5. Step 5: Solve for x
    x = 768,074.57/899.07
  6. Step 6: Final answer
    x = 854.30

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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.