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Finding the Fourth Proportional to 1,325.75, 1,830.08 and 861.35

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Solution

The fourth proportional to 1,325.75, 1,830.08 and 861.35 is: 1,189.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,325.75 : 1,830.08 = 861.35 : x
  2. Step 2: Convert to fraction form
    1,325.75/1,830.08 = 861.35/x
  3. Step 3: Cross multiply
    1,325.75x = 1,830.08 × 861.35
  4. Step 4: Simplify right side
    1,325.75x = 1,576,335.10
  5. Step 5: Solve for x
    x = 1,576,335.10/1,325.75
  6. Step 6: Final answer
    x = 1,189.01

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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.