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Finding the Fourth Proportional to 842.30, 1,261.49 and 430.41

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Solution

The fourth proportional to 842.30, 1,261.49 and 430.41 is: 644.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    842.30 : 1,261.49 = 430.41 : x
  2. Step 2: Convert to fraction form
    842.30/1,261.49 = 430.41/x
  3. Step 3: Cross multiply
    842.30x = 1,261.49 × 430.41
  4. Step 4: Simplify right side
    842.30x = 542,955.76
  5. Step 5: Solve for x
    x = 542,955.76/842.30
  6. Step 6: Final answer
    x = 644.61

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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.