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Finding the Fourth Proportional to 668.79, 920.87 and 569.03

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Solution

The fourth proportional to 668.79, 920.87 and 569.03 is: 783.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.79 : 920.87 = 569.03 : x
  2. Step 2: Convert to fraction form
    668.79/920.87 = 569.03/x
  3. Step 3: Cross multiply
    668.79x = 920.87 × 569.03
  4. Step 4: Simplify right side
    668.79x = 523,997.34
  5. Step 5: Solve for x
    x = 523,997.34/668.79
  6. Step 6: Final answer
    x = 783.50

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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.