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Finding the Fourth Proportional to 7,139.66, 9,852.39 and 3,995.64

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Solution

The fourth proportional to 7,139.66, 9,852.39 and 3,995.64 is: 5,513.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,139.66 : 9,852.39 = 3,995.64 : x
  2. Step 2: Convert to fraction form
    7,139.66/9,852.39 = 3,995.64/x
  3. Step 3: Cross multiply
    7,139.66x = 9,852.39 × 3,995.64
  4. Step 4: Simplify right side
    7,139.66x = 39,366,603.58
  5. Step 5: Solve for x
    x = 39,366,603.58/7,139.66
  6. Step 6: Final answer
    x = 5,513.80

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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.