Home / 7,128-9,836.16-3,941.28

Finding the Fourth Proportional to 7,128, 9,836.16 and 3,941.28

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Solution

The fourth proportional to 7,128, 9,836.16 and 3,941.28 is: 5,438.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,128 : 9,836.16 = 3,941.28 : x
  2. Step 2: Convert to fraction form
    7,128/9,836.16 = 3,941.28/x
  3. Step 3: Cross multiply
    7,128x = 9,836.16 × 3,941.28
  4. Step 4: Simplify right side
    7,128x = 38,767,060.68
  5. Step 5: Solve for x
    x = 38,767,060.68/7,128
  6. Step 6: Final answer
    x = 5,438.70

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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.