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Finding the Fourth Proportional to 910.76, 1,256.86 and 517.92

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Solution

The fourth proportional to 910.76, 1,256.86 and 517.92 is: 714.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    910.76 : 1,256.86 = 517.92 : x
  2. Step 2: Convert to fraction form
    910.76/1,256.86 = 517.92/x
  3. Step 3: Cross multiply
    910.76x = 1,256.86 × 517.92
  4. Step 4: Simplify right side
    910.76x = 650,952.93
  5. Step 5: Solve for x
    x = 650,952.93/910.76
  6. Step 6: Final answer
    x = 714.74

Related Problems

Find fourth proportional to 455.38, 628.43 and 258.96
Half scale
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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.