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Finding the Fourth Proportional to 915.99, 1,263.36 and 636.22

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Solution

The fourth proportional to 915.99, 1,263.36 and 636.22 is: 877.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.99 : 1,263.36 = 636.22 : x
  2. Step 2: Convert to fraction form
    915.99/1,263.36 = 636.22/x
  3. Step 3: Cross multiply
    915.99x = 1,263.36 × 636.22
  4. Step 4: Simplify right side
    915.99x = 803,774.90
  5. Step 5: Solve for x
    x = 803,774.90/915.99
  6. Step 6: Final answer
    x = 877.49

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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.