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Finding the Fourth Proportional to 775.82, 1,070.62 and 477.20

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Solution

The fourth proportional to 775.82, 1,070.62 and 477.20 is: 658.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    775.82 : 1,070.62 = 477.20 : x
  2. Step 2: Convert to fraction form
    775.82/1,070.62 = 477.20/x
  3. Step 3: Cross multiply
    775.82x = 1,070.62 × 477.20
  4. Step 4: Simplify right side
    775.82x = 510,901.35
  5. Step 5: Solve for x
    x = 510,901.35/775.82
  6. Step 6: Final answer
    x = 658.53

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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.