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Finding the Fourth Proportional to 668.78, 922.50 and 435.90

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Solution

The fourth proportional to 668.78, 922.50 and 435.90 is: 601.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.78 : 922.50 = 435.90 : x
  2. Step 2: Convert to fraction form
    668.78/922.50 = 435.90/x
  3. Step 3: Cross multiply
    668.78x = 922.50 × 435.90
  4. Step 4: Simplify right side
    668.78x = 402,117.75
  5. Step 5: Solve for x
    x = 402,117.75/668.78
  6. Step 6: Final answer
    x = 601.27

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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.