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Finding the Fourth Proportional to 838.21, 1,256.61 and 578.26

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Solution

The fourth proportional to 838.21, 1,256.61 and 578.26 is: 866.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    838.21 : 1,256.61 = 578.26 : x
  2. Step 2: Convert to fraction form
    838.21/1,256.61 = 578.26/x
  3. Step 3: Cross multiply
    838.21x = 1,256.61 × 578.26
  4. Step 4: Simplify right side
    838.21x = 726,647.30
  5. Step 5: Solve for x
    x = 726,647.30/838.21
  6. Step 6: Final answer
    x = 866.90

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.