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Finding the Fourth Proportional to 910.15, 1,255.83 and 556.09

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Solution

The fourth proportional to 910.15, 1,255.83 and 556.09 is: 767.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    910.15 : 1,255.83 = 556.09 : x
  2. Step 2: Convert to fraction form
    910.15/1,255.83 = 556.09/x
  3. Step 3: Cross multiply
    910.15x = 1,255.83 × 556.09
  4. Step 4: Simplify right side
    910.15x = 698,354.50
  5. Step 5: Solve for x
    x = 698,354.50/910.15
  6. Step 6: Final answer
    x = 767.30

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1.5x scale

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.