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Finding the Fourth Proportional to 989, 1,364.90 and 575.08

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Solution

The fourth proportional to 989, 1,364.90 and 575.08 is: 793.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    989 : 1,364.90 = 575.08 : x
  2. Step 2: Convert to fraction form
    989/1,364.90 = 575.08/x
  3. Step 3: Cross multiply
    989x = 1,364.90 × 575.08
  4. Step 4: Simplify right side
    989x = 784,926.69
  5. Step 5: Solve for x
    x = 784,926.69/989
  6. Step 6: Final answer
    x = 793.66

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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.