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Finding the Fourth Proportional to 1,320.32, 1,822.01 and 722.79

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Solution

The fourth proportional to 1,320.32, 1,822.01 and 722.79 is: 997.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,320.32 : 1,822.01 = 722.79 : x
  2. Step 2: Convert to fraction form
    1,320.32/1,822.01 = 722.79/x
  3. Step 3: Cross multiply
    1,320.32x = 1,822.01 × 722.79
  4. Step 4: Simplify right side
    1,320.32x = 1,316,926.99
  5. Step 5: Solve for x
    x = 1,316,926.99/1,320.32
  6. Step 6: Final answer
    x = 997.43

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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.