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Finding the Fourth Proportional to 929.24, 1,282.20 and 580.40

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Solution

The fourth proportional to 929.24, 1,282.20 and 580.40 is: 800.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    929.24 : 1,282.20 = 580.40 : x
  2. Step 2: Convert to fraction form
    929.24/1,282.20 = 580.40/x
  3. Step 3: Cross multiply
    929.24x = 1,282.20 × 580.40
  4. Step 4: Simplify right side
    929.24x = 744,188.88
  5. Step 5: Solve for x
    x = 744,188.88/929.24
  6. Step 6: Final answer
    x = 800.86

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.