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Finding the Fourth Proportional to 7,139.87, 9,848.94 and 4,155.36

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Solution

The fourth proportional to 7,139.87, 9,848.94 and 4,155.36 is: 5,732.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,139.87 : 9,848.94 = 4,155.36 : x
  2. Step 2: Convert to fraction form
    7,139.87/9,848.94 = 4,155.36/x
  3. Step 3: Cross multiply
    7,139.87x = 9,848.94 × 4,155.36
  4. Step 4: Simplify right side
    7,139.87x = 40,925,891.32
  5. Step 5: Solve for x
    x = 40,925,891.32/7,139.87
  6. Step 6: Final answer
    x = 5,732.02

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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.