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Finding the Fourth Proportional to 972.81, 1,342.06 and 579.76

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Solution

The fourth proportional to 972.81, 1,342.06 and 579.76 is: 799.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    972.81 : 1,342.06 = 579.76 : x
  2. Step 2: Convert to fraction form
    972.81/1,342.06 = 579.76/x
  3. Step 3: Cross multiply
    972.81x = 1,342.06 × 579.76
  4. Step 4: Simplify right side
    972.81x = 778,067.90
  5. Step 5: Solve for x
    x = 778,067.90/972.81
  6. Step 6: Final answer
    x = 799.81

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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.