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Finding the Fourth Proportional to 910.15, 1,255.80 and 555.79

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Solution

The fourth proportional to 910.15, 1,255.80 and 555.79 is: 766.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    910.15 : 1,255.80 = 555.79 : x
  2. Step 2: Convert to fraction form
    910.15/1,255.80 = 555.79/x
  3. Step 3: Cross multiply
    910.15x = 1,255.80 × 555.79
  4. Step 4: Simplify right side
    910.15x = 697,961.08
  5. Step 5: Solve for x
    x = 697,961.08/910.15
  6. Step 6: Final answer
    x = 766.86

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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.