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Finding the Fourth Proportional to 668.55, 921.90 and 469.56

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Solution

The fourth proportional to 668.55, 921.90 and 469.56 is: 647.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.55 : 921.90 = 469.56 : x
  2. Step 2: Convert to fraction form
    668.55/921.90 = 469.56/x
  3. Step 3: Cross multiply
    668.55x = 921.90 × 469.56
  4. Step 4: Simplify right side
    668.55x = 432,887.36
  5. Step 5: Solve for x
    x = 432,887.36/668.55
  6. Step 6: Final answer
    x = 647.50

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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.