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Finding the Fourth Proportional to 910.76, 1,256.85 and 517.91

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Solution

The fourth proportional to 910.76, 1,256.85 and 517.91 is: 714.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    910.76 : 1,256.85 = 517.91 : x
  2. Step 2: Convert to fraction form
    910.76/1,256.85 = 517.91/x
  3. Step 3: Cross multiply
    910.76x = 1,256.85 × 517.91
  4. Step 4: Simplify right side
    910.76x = 650,935.18
  5. Step 5: Solve for x
    x = 650,935.18/910.76
  6. Step 6: Final answer
    x = 714.72

Related Problems

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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.