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Finding the Fourth Proportional to 3,989.79, 5,503.10 and 3,457.71

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Solution

The fourth proportional to 3,989.79, 5,503.10 and 3,457.71 is: 4,769.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,989.79 : 5,503.10 = 3,457.71 : x
  2. Step 2: Convert to fraction form
    3,989.79/5,503.10 = 3,457.71/x
  3. Step 3: Cross multiply
    3,989.79x = 5,503.10 × 3,457.71
  4. Step 4: Simplify right side
    3,989.79x = 19,028,106.61
  5. Step 5: Solve for x
    x = 19,028,106.61/3,989.79
  6. Step 6: Final answer
    x = 4,769.20

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1.5x scale

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.