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Finding the Fourth Proportional to 941.13, 1,411.70 and 428.13

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Solution

The fourth proportional to 941.13, 1,411.70 and 428.13 is: 642.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    941.13 : 1,411.70 = 428.13 : x
  2. Step 2: Convert to fraction form
    941.13/1,411.70 = 428.13/x
  3. Step 3: Cross multiply
    941.13x = 1,411.70 × 428.13
  4. Step 4: Simplify right side
    941.13x = 604,391.12
  5. Step 5: Solve for x
    x = 604,391.12/941.13
  6. Step 6: Final answer
    x = 642.20

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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.