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Finding the Fourth Proportional to 917.68, 1,266.42 and 519.27

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Solution

The fourth proportional to 917.68, 1,266.42 and 519.27 is: 716.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.68 : 1,266.42 = 519.27 : x
  2. Step 2: Convert to fraction form
    917.68/1,266.42 = 519.27/x
  3. Step 3: Cross multiply
    917.68x = 1,266.42 × 519.27
  4. Step 4: Simplify right side
    917.68x = 657,613.91
  5. Step 5: Solve for x
    x = 657,613.91/917.68
  6. Step 6: Final answer
    x = 716.60

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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.