Home / 7,347.60-10,139.69-3,990.42

Finding the Fourth Proportional to 7,347.60, 10,139.69 and 3,990.42

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Solution

The fourth proportional to 7,347.60, 10,139.69 and 3,990.42 is: 5,506.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,347.60 : 10,139.69 = 3,990.42 : x
  2. Step 2: Convert to fraction form
    7,347.60/10,139.69 = 3,990.42/x
  3. Step 3: Cross multiply
    7,347.60x = 10,139.69 × 3,990.42
  4. Step 4: Simplify right side
    7,347.60x = 40,461,621.77
  5. Step 5: Solve for x
    x = 40,461,621.77/7,347.60
  6. Step 6: Final answer
    x = 5,506.78

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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.