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Finding the Fourth Proportional to 875.94, 1,207.66 and 717.99

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Solution

The fourth proportional to 875.94, 1,207.66 and 717.99 is: 989.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.94 : 1,207.66 = 717.99 : x
  2. Step 2: Convert to fraction form
    875.94/1,207.66 = 717.99/x
  3. Step 3: Cross multiply
    875.94x = 1,207.66 × 717.99
  4. Step 4: Simplify right side
    875.94x = 867,087.80
  5. Step 5: Solve for x
    x = 867,087.80/875.94
  6. Step 6: Final answer
    x = 989.89

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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.