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Finding the Fourth Proportional to 1,235.32, 1,701.81 and 861.62

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Solution

The fourth proportional to 1,235.32, 1,701.81 and 861.62 is: 1,186.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,235.32 : 1,701.81 = 861.62 : x
  2. Step 2: Convert to fraction form
    1,235.32/1,701.81 = 861.62/x
  3. Step 3: Cross multiply
    1,235.32x = 1,701.81 × 861.62
  4. Step 4: Simplify right side
    1,235.32x = 1,466,305.02
  5. Step 5: Solve for x
    x = 1,466,305.02/1,235.32
  6. Step 6: Final answer
    x = 1,186.99

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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.