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Finding the Fourth Proportional to 910.54, 1,259.50 and 851.77

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Solution

The fourth proportional to 910.54, 1,259.50 and 851.77 is: 1,178.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    910.54 : 1,259.50 = 851.77 : x
  2. Step 2: Convert to fraction form
    910.54/1,259.50 = 851.77/x
  3. Step 3: Cross multiply
    910.54x = 1,259.50 × 851.77
  4. Step 4: Simplify right side
    910.54x = 1,072,798.27
  5. Step 5: Solve for x
    x = 1,072,798.27/910.54
  6. Step 6: Final answer
    x = 1,178.20

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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.