Home / 7,347.39-10,139.22-3,990.21

Finding the Fourth Proportional to 7,347.39, 10,139.22 and 3,990.21

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Solution

The fourth proportional to 7,347.39, 10,139.22 and 3,990.21 is: 5,506.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,347.39 : 10,139.22 = 3,990.21 : x
  2. Step 2: Convert to fraction form
    7,347.39/10,139.22 = 3,990.21/x
  3. Step 3: Cross multiply
    7,347.39x = 10,139.22 × 3,990.21
  4. Step 4: Simplify right side
    7,347.39x = 40,457,617.04
  5. Step 5: Solve for x
    x = 40,457,617.04/7,347.39
  6. Step 6: Final answer
    x = 5,506.39

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Half scale
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Double scale
Find fourth proportional to 7,348.39, 10,140.60 and 3,991.21
Similar ratio
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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.