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Finding the Fourth Proportional to 910.76, 1,256.72 and 517.84

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Solution

The fourth proportional to 910.76, 1,256.72 and 517.84 is: 714.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    910.76 : 1,256.72 = 517.84 : x
  2. Step 2: Convert to fraction form
    910.76/1,256.72 = 517.84/x
  3. Step 3: Cross multiply
    910.76x = 1,256.72 × 517.84
  4. Step 4: Simplify right side
    910.76x = 650,779.88
  5. Step 5: Solve for x
    x = 650,779.88/910.76
  6. Step 6: Final answer
    x = 714.55

Related Problems

Find fourth proportional to 455.38, 628.36 and 258.92
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.