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Finding the Fourth Proportional to 915.86, 1,373.64 and 266.42

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Solution

The fourth proportional to 915.86, 1,373.64 and 266.42 is: 399.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.86 : 1,373.64 = 266.42 : x
  2. Step 2: Convert to fraction form
    915.86/1,373.64 = 266.42/x
  3. Step 3: Cross multiply
    915.86x = 1,373.64 × 266.42
  4. Step 4: Simplify right side
    915.86x = 365,958.30
  5. Step 5: Solve for x
    x = 365,958.30/915.86
  6. Step 6: Final answer
    x = 399.58

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.