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Finding the Fourth Proportional to 888.17, 1,221.38 and 722.01

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Solution

The fourth proportional to 888.17, 1,221.38 and 722.01 is: 992.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    888.17 : 1,221.38 = 722.01 : x
  2. Step 2: Convert to fraction form
    888.17/1,221.38 = 722.01/x
  3. Step 3: Cross multiply
    888.17x = 1,221.38 × 722.01
  4. Step 4: Simplify right side
    888.17x = 881,852.25
  5. Step 5: Solve for x
    x = 881,852.25/888.17
  6. Step 6: Final answer
    x = 992.89

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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.