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Finding the Fourth Proportional to 910.14, 1,256.58 and 561.42

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Solution

The fourth proportional to 910.14, 1,256.58 and 561.42 is: 775.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    910.14 : 1,256.58 = 561.42 : x
  2. Step 2: Convert to fraction form
    910.14/1,256.58 = 561.42/x
  3. Step 3: Cross multiply
    910.14x = 1,256.58 × 561.42
  4. Step 4: Simplify right side
    910.14x = 705,469.14
  5. Step 5: Solve for x
    x = 705,469.14/910.14
  6. Step 6: Final answer
    x = 775.12

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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.