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Finding the Fourth Proportional to 775.39, 1,070.11 and 426.15

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Solution

The fourth proportional to 775.39, 1,070.11 and 426.15 is: 588.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    775.39 : 1,070.11 = 426.15 : x
  2. Step 2: Convert to fraction form
    775.39/1,070.11 = 426.15/x
  3. Step 3: Cross multiply
    775.39x = 1,070.11 × 426.15
  4. Step 4: Simplify right side
    775.39x = 456,021.77
  5. Step 5: Solve for x
    x = 456,021.77/775.39
  6. Step 6: Final answer
    x = 588.12

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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.