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Finding the Fourth Proportional to 1,289.10, 1,778.04 and 910.38

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Solution

The fourth proportional to 1,289.10, 1,778.04 and 910.38 is: 1,255.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,289.10 : 1,778.04 = 910.38 : x
  2. Step 2: Convert to fraction form
    1,289.10/1,778.04 = 910.38/x
  3. Step 3: Cross multiply
    1,289.10x = 1,778.04 × 910.38
  4. Step 4: Simplify right side
    1,289.10x = 1,618,692.06
  5. Step 5: Solve for x
    x = 1,618,692.06/1,289.10
  6. Step 6: Final answer
    x = 1,255.68

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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.