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Finding the Fourth Proportional to 775.70, 1,070.40 and 426.40

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Solution

The fourth proportional to 775.70, 1,070.40 and 426.40 is: 588.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    775.70 : 1,070.40 = 426.40 : x
  2. Step 2: Convert to fraction form
    775.70/1,070.40 = 426.40/x
  3. Step 3: Cross multiply
    775.70x = 1,070.40 × 426.40
  4. Step 4: Simplify right side
    775.70x = 456,418.56
  5. Step 5: Solve for x
    x = 456,418.56/775.70
  6. Step 6: Final answer
    x = 588.40

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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.