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Finding the Fourth Proportional to 786.25, 1,085.28 and 454.75

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Solution

The fourth proportional to 786.25, 1,085.28 and 454.75 is: 627.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    786.25 : 1,085.28 = 454.75 : x
  2. Step 2: Convert to fraction form
    786.25/1,085.28 = 454.75/x
  3. Step 3: Cross multiply
    786.25x = 1,085.28 × 454.75
  4. Step 4: Simplify right side
    786.25x = 493,531.08
  5. Step 5: Solve for x
    x = 493,531.08/786.25
  6. Step 6: Final answer
    x = 627.70

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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.