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Finding the Fourth Proportional to 972.42, 1,341.98 and 552.79

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Solution

The fourth proportional to 972.42, 1,341.98 and 552.79 is: 762.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    972.42 : 1,341.98 = 552.79 : x
  2. Step 2: Convert to fraction form
    972.42/1,341.98 = 552.79/x
  3. Step 3: Cross multiply
    972.42x = 1,341.98 × 552.79
  4. Step 4: Simplify right side
    972.42x = 741,832.56
  5. Step 5: Solve for x
    x = 741,832.56/972.42
  6. Step 6: Final answer
    x = 762.87

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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.