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Finding the Fourth Proportional to 885.18, 1,221 and 719.40

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Solution

The fourth proportional to 885.18, 1,221 and 719.40 is: 992.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    885.18 : 1,221 = 719.40 : x
  2. Step 2: Convert to fraction form
    885.18/1,221 = 719.40/x
  3. Step 3: Cross multiply
    885.18x = 1,221 × 719.40
  4. Step 4: Simplify right side
    885.18x = 878,387.40
  5. Step 5: Solve for x
    x = 878,387.40/885.18
  6. Step 6: Final answer
    x = 992.33

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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.