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Finding the Fourth Proportional to 681.54, 1,020.34 and 611.20

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Solution

The fourth proportional to 681.54, 1,020.34 and 611.20 is: 915.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.54 : 1,020.34 = 611.20 : x
  2. Step 2: Convert to fraction form
    681.54/1,020.34 = 611.20/x
  3. Step 3: Cross multiply
    681.54x = 1,020.34 × 611.20
  4. Step 4: Simplify right side
    681.54x = 623,631.81
  5. Step 5: Solve for x
    x = 623,631.81/681.54
  6. Step 6: Final answer
    x = 915.03

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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.