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Finding the Fourth Proportional to 7,347.69, 10,139.92 and 3,990.51

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Solution

The fourth proportional to 7,347.69, 10,139.92 and 3,990.51 is: 5,506.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,347.69 : 10,139.92 = 3,990.51 : x
  2. Step 2: Convert to fraction form
    7,347.69/10,139.92 = 3,990.51/x
  3. Step 3: Cross multiply
    7,347.69x = 10,139.92 × 3,990.51
  4. Step 4: Simplify right side
    7,347.69x = 40,463,442.18
  5. Step 5: Solve for x
    x = 40,463,442.18/7,347.69
  6. Step 6: Final answer
    x = 5,506.96

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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.