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Finding the Fourth Proportional to 915.85, 1,265.40 and 861.04

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Solution

The fourth proportional to 915.85, 1,265.40 and 861.04 is: 1,189.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.85 : 1,265.40 = 861.04 : x
  2. Step 2: Convert to fraction form
    915.85/1,265.40 = 861.04/x
  3. Step 3: Cross multiply
    915.85x = 1,265.40 × 861.04
  4. Step 4: Simplify right side
    915.85x = 1,089,560.02
  5. Step 5: Solve for x
    x = 1,089,560.02/915.85
  6. Step 6: Final answer
    x = 1,189.67

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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.