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Finding the Fourth Proportional to 972.02, 1,340.34 and 722.92

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Solution

The fourth proportional to 972.02, 1,340.34 and 722.92 is: 996.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    972.02 : 1,340.34 = 722.92 : x
  2. Step 2: Convert to fraction form
    972.02/1,340.34 = 722.92/x
  3. Step 3: Cross multiply
    972.02x = 1,340.34 × 722.92
  4. Step 4: Simplify right side
    972.02x = 968,958.59
  5. Step 5: Solve for x
    x = 968,958.59/972.02
  6. Step 6: Final answer
    x = 996.85

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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.