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Finding the Fourth Proportional to 775.75, 1,070.54 and 426.45

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Solution

The fourth proportional to 775.75, 1,070.54 and 426.45 is: 588.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    775.75 : 1,070.54 = 426.45 : x
  2. Step 2: Convert to fraction form
    775.75/1,070.54 = 426.45/x
  3. Step 3: Cross multiply
    775.75x = 1,070.54 × 426.45
  4. Step 4: Simplify right side
    775.75x = 456,531.78
  5. Step 5: Solve for x
    x = 456,531.78/775.75
  6. Step 6: Final answer
    x = 588.50

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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.