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Finding the Fourth Proportional to 910.31, 1,256.42 and 556.29

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Solution

The fourth proportional to 910.31, 1,256.42 and 556.29 is: 767.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    910.31 : 1,256.42 = 556.29 : x
  2. Step 2: Convert to fraction form
    910.31/1,256.42 = 556.29/x
  3. Step 3: Cross multiply
    910.31x = 1,256.42 × 556.29
  4. Step 4: Simplify right side
    910.31x = 698,935.27
  5. Step 5: Solve for x
    x = 698,935.27/910.31
  6. Step 6: Final answer
    x = 767.80

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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.