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Finding the Fourth Proportional to 972.19, 1,341.52 and 579.21

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Solution

The fourth proportional to 972.19, 1,341.52 and 579.21 is: 799.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    972.19 : 1,341.52 = 579.21 : x
  2. Step 2: Convert to fraction form
    972.19/1,341.52 = 579.21/x
  3. Step 3: Cross multiply
    972.19x = 1,341.52 × 579.21
  4. Step 4: Simplify right side
    972.19x = 777,021.80
  5. Step 5: Solve for x
    x = 777,021.80/972.19
  6. Step 6: Final answer
    x = 799.25

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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.