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Finding the Fourth Proportional to 775.38, 1,070.03 and 421.31

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Solution

The fourth proportional to 775.38, 1,070.03 and 421.31 is: 581.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    775.38 : 1,070.03 = 421.31 : x
  2. Step 2: Convert to fraction form
    775.38/1,070.03 = 421.31/x
  3. Step 3: Cross multiply
    775.38x = 1,070.03 × 421.31
  4. Step 4: Simplify right side
    775.38x = 450,814.34
  5. Step 5: Solve for x
    x = 450,814.34/775.38
  6. Step 6: Final answer
    x = 581.41

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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.