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Finding the Fourth Proportional to 915.67, 1,259.85 and 804.95

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Solution

The fourth proportional to 915.67, 1,259.85 and 804.95 is: 1,107.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.67 : 1,259.85 = 804.95 : x
  2. Step 2: Convert to fraction form
    915.67/1,259.85 = 804.95/x
  3. Step 3: Cross multiply
    915.67x = 1,259.85 × 804.95
  4. Step 4: Simplify right side
    915.67x = 1,014,124.79
  5. Step 5: Solve for x
    x = 1,014,124.79/915.67
  6. Step 6: Final answer
    x = 1,107.52

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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.