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Finding the Fourth Proportional to 675.28, 1,011.36 and 580.40

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Solution

The fourth proportional to 675.28, 1,011.36 and 580.40 is: 869.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    675.28 : 1,011.36 = 580.40 : x
  2. Step 2: Convert to fraction form
    675.28/1,011.36 = 580.40/x
  3. Step 3: Cross multiply
    675.28x = 1,011.36 × 580.40
  4. Step 4: Simplify right side
    675.28x = 586,993.34
  5. Step 5: Solve for x
    x = 586,993.34/675.28
  6. Step 6: Final answer
    x = 869.26

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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.