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Finding the Fourth Proportional to 910.79, 1,256.94 and 517.94

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Solution

The fourth proportional to 910.79, 1,256.94 and 517.94 is: 714.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    910.79 : 1,256.94 = 517.94 : x
  2. Step 2: Convert to fraction form
    910.79/1,256.94 = 517.94/x
  3. Step 3: Cross multiply
    910.79x = 1,256.94 × 517.94
  4. Step 4: Simplify right side
    910.79x = 651,013.22
  5. Step 5: Solve for x
    x = 651,013.22/910.79
  6. Step 6: Final answer
    x = 714.78

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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.