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Finding the Fourth Proportional to 775.70, 1,070.48 and 421.63

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Solution

The fourth proportional to 775.70, 1,070.48 and 421.63 is: 581.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    775.70 : 1,070.48 = 421.63 : x
  2. Step 2: Convert to fraction form
    775.70/1,070.48 = 421.63/x
  3. Step 3: Cross multiply
    775.70x = 1,070.48 × 421.63
  4. Step 4: Simplify right side
    775.70x = 451,342.75
  5. Step 5: Solve for x
    x = 451,342.75/775.70
  6. Step 6: Final answer
    x = 581.85

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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.