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Finding the Fourth Proportional to 910.76, 1,257.72 and 785.24

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Solution

The fourth proportional to 910.76, 1,257.72 and 785.24 is: 1,084.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    910.76 : 1,257.72 = 785.24 : x
  2. Step 2: Convert to fraction form
    910.76/1,257.72 = 785.24/x
  3. Step 3: Cross multiply
    910.76x = 1,257.72 × 785.24
  4. Step 4: Simplify right side
    910.76x = 987,612.05
  5. Step 5: Solve for x
    x = 987,612.05/910.76
  6. Step 6: Final answer
    x = 1,084.38

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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.