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Finding the Fourth Proportional to 775.56, 1,069.16 and 480.32

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Solution

The fourth proportional to 775.56, 1,069.16 and 480.32 is: 662.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    775.56 : 1,069.16 = 480.32 : x
  2. Step 2: Convert to fraction form
    775.56/1,069.16 = 480.32/x
  3. Step 3: Cross multiply
    775.56x = 1,069.16 × 480.32
  4. Step 4: Simplify right side
    775.56x = 513,531.18
  5. Step 5: Solve for x
    x = 513,531.18/775.56
  6. Step 6: Final answer
    x = 662.14

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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.