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Finding the Fourth Proportional to 3,913.01, 5,869.53 and 991.55

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Solution

The fourth proportional to 3,913.01, 5,869.53 and 991.55 is: 1,487.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,913.01 : 5,869.53 = 991.55 : x
  2. Step 2: Convert to fraction form
    3,913.01/5,869.53 = 991.55/x
  3. Step 3: Cross multiply
    3,913.01x = 5,869.53 × 991.55
  4. Step 4: Simplify right side
    3,913.01x = 5,819,932.47
  5. Step 5: Solve for x
    x = 5,819,932.47/3,913.01
  6. Step 6: Final answer
    x = 1,487.33

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1.5x scale

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.