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Finding the Fourth Proportional to 941.05, 1,411.21 and 421.21

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Solution

The fourth proportional to 941.05, 1,411.21 and 421.21 is: 631.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    941.05 : 1,411.21 = 421.21 : x
  2. Step 2: Convert to fraction form
    941.05/1,411.21 = 421.21/x
  3. Step 3: Cross multiply
    941.05x = 1,411.21 × 421.21
  4. Step 4: Simplify right side
    941.05x = 594,415.76
  5. Step 5: Solve for x
    x = 594,415.76/941.05
  6. Step 6: Final answer
    x = 631.65

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Double scale
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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.