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Finding the Fourth Proportional to 669.42, 924.24 and 421.08

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Solution

The fourth proportional to 669.42, 924.24 and 421.08 is: 581.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    669.42 : 924.24 = 421.08 : x
  2. Step 2: Convert to fraction form
    669.42/924.24 = 421.08/x
  3. Step 3: Cross multiply
    669.42x = 924.24 × 421.08
  4. Step 4: Simplify right side
    669.42x = 389,178.98
  5. Step 5: Solve for x
    x = 389,178.98/669.42
  6. Step 6: Final answer
    x = 581.37

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1.5x scale

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.