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Finding the Fourth Proportional to 910.75, 1,256.67 and 517.70

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Solution

The fourth proportional to 910.75, 1,256.67 and 517.70 is: 714.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    910.75 : 1,256.67 = 517.70 : x
  2. Step 2: Convert to fraction form
    910.75/1,256.67 = 517.70/x
  3. Step 3: Cross multiply
    910.75x = 1,256.67 × 517.70
  4. Step 4: Simplify right side
    910.75x = 650,578.06
  5. Step 5: Solve for x
    x = 650,578.06/910.75
  6. Step 6: Final answer
    x = 714.33

Related Problems

Find fourth proportional to 455.38, 628.34 and 258.85
Half scale
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Double scale
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Similar ratio
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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.