Home / 7,347.45-10,139.34-3,990.21

Finding the Fourth Proportional to 7,347.45, 10,139.34 and 3,990.21

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Solution

The fourth proportional to 7,347.45, 10,139.34 and 3,990.21 is: 5,506.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,347.45 : 10,139.34 = 3,990.21 : x
  2. Step 2: Convert to fraction form
    7,347.45/10,139.34 = 3,990.21/x
  3. Step 3: Cross multiply
    7,347.45x = 10,139.34 × 3,990.21
  4. Step 4: Simplify right side
    7,347.45x = 40,458,095.86
  5. Step 5: Solve for x
    x = 40,458,095.86/7,347.45
  6. Step 6: Final answer
    x = 5,506.41

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Half scale
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Double scale
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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.