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Finding the Fourth Proportional to 668.15, 921.99 and 402.63

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Solution

The fourth proportional to 668.15, 921.99 and 402.63 is: 555.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.15 : 921.99 = 402.63 : x
  2. Step 2: Convert to fraction form
    668.15/921.99 = 402.63/x
  3. Step 3: Cross multiply
    668.15x = 921.99 × 402.63
  4. Step 4: Simplify right side
    668.15x = 371,220.83
  5. Step 5: Solve for x
    x = 371,220.83/668.15
  6. Step 6: Final answer
    x = 555.60

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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.