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Finding the Fourth Proportional to 830.92, 1,243.67 and 611.49

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Solution

The fourth proportional to 830.92, 1,243.67 and 611.49 is: 915.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    830.92 : 1,243.67 = 611.49 : x
  2. Step 2: Convert to fraction form
    830.92/1,243.67 = 611.49/x
  3. Step 3: Cross multiply
    830.92x = 1,243.67 × 611.49
  4. Step 4: Simplify right side
    830.92x = 760,491.77
  5. Step 5: Solve for x
    x = 760,491.77/830.92
  6. Step 6: Final answer
    x = 915.24

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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.