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Finding the Fourth Proportional to 917.75, 1,266.57 and 519.45

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Solution

The fourth proportional to 917.75, 1,266.57 and 519.45 is: 716.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.75 : 1,266.57 = 519.45 : x
  2. Step 2: Convert to fraction form
    917.75/1,266.57 = 519.45/x
  3. Step 3: Cross multiply
    917.75x = 1,266.57 × 519.45
  4. Step 4: Simplify right side
    917.75x = 657,919.79
  5. Step 5: Solve for x
    x = 657,919.79/917.75
  6. Step 6: Final answer
    x = 716.89

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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.