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Finding the Fourth Proportional to 895.09, 1,234.89 and 685.05

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Solution

The fourth proportional to 895.09, 1,234.89 and 685.05 is: 945.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    895.09 : 1,234.89 = 685.05 : x
  2. Step 2: Convert to fraction form
    895.09/1,234.89 = 685.05/x
  3. Step 3: Cross multiply
    895.09x = 1,234.89 × 685.05
  4. Step 4: Simplify right side
    895.09x = 845,961.39
  5. Step 5: Solve for x
    x = 845,961.39/895.09
  6. Step 6: Final answer
    x = 945.11

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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.