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Finding the Fourth Proportional to 775.55, 1,071.96 and 681.59

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Solution

The fourth proportional to 775.55, 1,071.96 and 681.59 is: 942.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    775.55 : 1,071.96 = 681.59 : x
  2. Step 2: Convert to fraction form
    775.55/1,071.96 = 681.59/x
  3. Step 3: Cross multiply
    775.55x = 1,071.96 × 681.59
  4. Step 4: Simplify right side
    775.55x = 730,637.22
  5. Step 5: Solve for x
    x = 730,637.22/775.55
  6. Step 6: Final answer
    x = 942.09

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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.