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Finding the Fourth Proportional to 972.50, 1,342.30 and 579.44

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Solution

The fourth proportional to 972.50, 1,342.30 and 579.44 is: 799.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    972.50 : 1,342.30 = 579.44 : x
  2. Step 2: Convert to fraction form
    972.50/1,342.30 = 579.44/x
  3. Step 3: Cross multiply
    972.50x = 1,342.30 × 579.44
  4. Step 4: Simplify right side
    972.50x = 777,782.31
  5. Step 5: Solve for x
    x = 777,782.31/972.50
  6. Step 6: Final answer
    x = 799.78

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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.