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Finding the Fourth Proportional to 892.56, 1,337.95 and 430.21

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Solution

The fourth proportional to 892.56, 1,337.95 and 430.21 is: 644.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    892.56 : 1,337.95 = 430.21 : x
  2. Step 2: Convert to fraction form
    892.56/1,337.95 = 430.21/x
  3. Step 3: Cross multiply
    892.56x = 1,337.95 × 430.21
  4. Step 4: Simplify right side
    892.56x = 575,599.47
  5. Step 5: Solve for x
    x = 575,599.47/892.56
  6. Step 6: Final answer
    x = 644.89

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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.