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Finding the Fourth Proportional to 1,089.65, 1,503.63 and 717.36

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Solution

The fourth proportional to 1,089.65, 1,503.63 and 717.36 is: 989.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,089.65 : 1,503.63 = 717.36 : x
  2. Step 2: Convert to fraction form
    1,089.65/1,503.63 = 717.36/x
  3. Step 3: Cross multiply
    1,089.65x = 1,503.63 × 717.36
  4. Step 4: Simplify right side
    1,089.65x = 1,078,644.02
  5. Step 5: Solve for x
    x = 1,078,644.02/1,089.65
  6. Step 6: Final answer
    x = 989.90

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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.