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Finding the Fourth Proportional to 669.44, 924.15 and 421.11

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Solution

The fourth proportional to 669.44, 924.15 and 421.11 is: 581.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    669.44 : 924.15 = 421.11 : x
  2. Step 2: Convert to fraction form
    669.44/924.15 = 421.11/x
  3. Step 3: Cross multiply
    669.44x = 924.15 × 421.11
  4. Step 4: Simplify right side
    669.44x = 389,168.81
  5. Step 5: Solve for x
    x = 389,168.81/669.44
  6. Step 6: Final answer
    x = 581.34

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Double scale
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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.