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Finding the Fourth Proportional to 916.26, 1,263.12 and 768.66

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Solution

The fourth proportional to 916.26, 1,263.12 and 768.66 is: 1,059.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    916.26 : 1,263.12 = 768.66 : x
  2. Step 2: Convert to fraction form
    916.26/1,263.12 = 768.66/x
  3. Step 3: Cross multiply
    916.26x = 1,263.12 × 768.66
  4. Step 4: Simplify right side
    916.26x = 970,909.82
  5. Step 5: Solve for x
    x = 970,909.82/916.26
  6. Step 6: Final answer
    x = 1,059.64

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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.