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Finding the Fourth Proportional to 988.83, 1,483.05 and 644.61

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Solution

The fourth proportional to 988.83, 1,483.05 and 644.61 is: 966.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.83 : 1,483.05 = 644.61 : x
  2. Step 2: Convert to fraction form
    988.83/1,483.05 = 644.61/x
  3. Step 3: Cross multiply
    988.83x = 1,483.05 × 644.61
  4. Step 4: Simplify right side
    988.83x = 955,988.86
  5. Step 5: Solve for x
    x = 955,988.86/988.83
  6. Step 6: Final answer
    x = 966.79

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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.