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Finding the Fourth Proportional to 988.83, 1,366.02 and 770.61

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Solution

The fourth proportional to 988.83, 1,366.02 and 770.61 is: 1,064.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.83 : 1,366.02 = 770.61 : x
  2. Step 2: Convert to fraction form
    988.83/1,366.02 = 770.61/x
  3. Step 3: Cross multiply
    988.83x = 1,366.02 × 770.61
  4. Step 4: Simplify right side
    988.83x = 1,052,668.67
  5. Step 5: Solve for x
    x = 1,052,668.67/988.83
  6. Step 6: Final answer
    x = 1,064.56

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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.