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Finding the Fourth Proportional to 915.33, 1,262.75 and 636.24

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Solution

The fourth proportional to 915.33, 1,262.75 and 636.24 is: 877.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.33 : 1,262.75 = 636.24 : x
  2. Step 2: Convert to fraction form
    915.33/1,262.75 = 636.24/x
  3. Step 3: Cross multiply
    915.33x = 1,262.75 × 636.24
  4. Step 4: Simplify right side
    915.33x = 803,412.06
  5. Step 5: Solve for x
    x = 803,412.06/915.33
  6. Step 6: Final answer
    x = 877.73

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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.