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Finding the Fourth Proportional to 775.38, 1,070.03 and 513.45

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Solution

The fourth proportional to 775.38, 1,070.03 and 513.45 is: 708.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    775.38 : 1,070.03 = 513.45 : x
  2. Step 2: Convert to fraction form
    775.38/1,070.03 = 513.45/x
  3. Step 3: Cross multiply
    775.38x = 1,070.03 × 513.45
  4. Step 4: Simplify right side
    775.38x = 549,406.90
  5. Step 5: Solve for x
    x = 549,406.90/775.38
  6. Step 6: Final answer
    x = 708.56

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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.