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Finding the Fourth Proportional to 917.72, 1,266.32 and 519.36

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Solution

The fourth proportional to 917.72, 1,266.32 and 519.36 is: 716.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    917.72 : 1,266.32 = 519.36 : x
  2. Step 2: Convert to fraction form
    917.72/1,266.32 = 519.36/x
  3. Step 3: Cross multiply
    917.72x = 1,266.32 × 519.36
  4. Step 4: Simplify right side
    917.72x = 657,675.96
  5. Step 5: Solve for x
    x = 657,675.96/917.72
  6. Step 6: Final answer
    x = 716.64

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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.