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Finding the Fourth Proportional to 915.08, 1,264.50 and 605

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Solution

The fourth proportional to 915.08, 1,264.50 and 605 is: 836.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.08 : 1,264.50 = 605 : x
  2. Step 2: Convert to fraction form
    915.08/1,264.50 = 605/x
  3. Step 3: Cross multiply
    915.08x = 1,264.50 × 605
  4. Step 4: Simplify right side
    915.08x = 765,022.50
  5. Step 5: Solve for x
    x = 765,022.50/915.08
  6. Step 6: Final answer
    x = 836.02

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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.