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Finding the Fourth Proportional to 910.70, 1,256.80 and 578.86

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Solution

The fourth proportional to 910.70, 1,256.80 and 578.86 is: 798.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    910.70 : 1,256.80 = 578.86 : x
  2. Step 2: Convert to fraction form
    910.70/1,256.80 = 578.86/x
  3. Step 3: Cross multiply
    910.70x = 1,256.80 × 578.86
  4. Step 4: Simplify right side
    910.70x = 727,511.25
  5. Step 5: Solve for x
    x = 727,511.25/910.70
  6. Step 6: Final answer
    x = 798.85

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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.