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Finding the Fourth Proportional to 775.26, 1,070.31 and 551.37

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Solution

The fourth proportional to 775.26, 1,070.31 and 551.37 is: 761.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    775.26 : 1,070.31 = 551.37 : x
  2. Step 2: Convert to fraction form
    775.26/1,070.31 = 551.37/x
  3. Step 3: Cross multiply
    775.26x = 1,070.31 × 551.37
  4. Step 4: Simplify right side
    775.26x = 590,136.82
  5. Step 5: Solve for x
    x = 590,136.82/775.26
  6. Step 6: Final answer
    x = 761.21

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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.