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Finding the Fourth Proportional to 931.98, 1,285.56 and 617.25

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Solution

The fourth proportional to 931.98, 1,285.56 and 617.25 is: 851.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.98 : 1,285.56 = 617.25 : x
  2. Step 2: Convert to fraction form
    931.98/1,285.56 = 617.25/x
  3. Step 3: Cross multiply
    931.98x = 1,285.56 × 617.25
  4. Step 4: Simplify right side
    931.98x = 793,511.91
  5. Step 5: Solve for x
    x = 793,511.91/931.98
  6. Step 6: Final answer
    x = 851.43

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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.