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Finding the Fourth Proportional to 988.86, 1,484.55 and 806.61

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Solution

The fourth proportional to 988.86, 1,484.55 and 806.61 is: 1,210.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.86 : 1,484.55 = 806.61 : x
  2. Step 2: Convert to fraction form
    988.86/1,484.55 = 806.61/x
  3. Step 3: Cross multiply
    988.86x = 1,484.55 × 806.61
  4. Step 4: Simplify right side
    988.86x = 1,197,452.88
  5. Step 5: Solve for x
    x = 1,197,452.88/988.86
  6. Step 6: Final answer
    x = 1,210.94

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.