Home / 7,347.20-10,139.21-3,990.05

Finding the Fourth Proportional to 7,347.20, 10,139.21 and 3,990.05

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Solution

The fourth proportional to 7,347.20, 10,139.21 and 3,990.05 is: 5,506.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,347.20 : 10,139.21 = 3,990.05 : x
  2. Step 2: Convert to fraction form
    7,347.20/10,139.21 = 3,990.05/x
  3. Step 3: Cross multiply
    7,347.20x = 10,139.21 × 3,990.05
  4. Step 4: Simplify right side
    7,347.20x = 40,455,904.16
  5. Step 5: Solve for x
    x = 40,455,904.16/7,347.20
  6. Step 6: Final answer
    x = 5,506.30

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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.