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Finding the Fourth Proportional to 857.28, 1,183.08 and 525.60

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Solution

The fourth proportional to 857.28, 1,183.08 and 525.60 is: 725.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    857.28 : 1,183.08 = 525.60 : x
  2. Step 2: Convert to fraction form
    857.28/1,183.08 = 525.60/x
  3. Step 3: Cross multiply
    857.28x = 1,183.08 × 525.60
  4. Step 4: Simplify right side
    857.28x = 621,826.85
  5. Step 5: Solve for x
    x = 621,826.85/857.28
  6. Step 6: Final answer
    x = 725.35

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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.