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Finding the Fourth Proportional to 857.72, 1,183.60 and 508.28

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Solution

The fourth proportional to 857.72, 1,183.60 and 508.28 is: 701.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    857.72 : 1,183.60 = 508.28 : x
  2. Step 2: Convert to fraction form
    857.72/1,183.60 = 508.28/x
  3. Step 3: Cross multiply
    857.72x = 1,183.60 × 508.28
  4. Step 4: Simplify right side
    857.72x = 601,600.21
  5. Step 5: Solve for x
    x = 601,600.21/857.72
  6. Step 6: Final answer
    x = 701.39

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Double scale
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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.