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Finding the Fourth Proportional to 670.11, 924.90 and 421.26

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Solution

The fourth proportional to 670.11, 924.90 and 421.26 is: 581.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    670.11 : 924.90 = 421.26 : x
  2. Step 2: Convert to fraction form
    670.11/924.90 = 421.26/x
  3. Step 3: Cross multiply
    670.11x = 924.90 × 421.26
  4. Step 4: Simplify right side
    670.11x = 389,623.37
  5. Step 5: Solve for x
    x = 389,623.37/670.11
  6. Step 6: Final answer
    x = 581.43

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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.