Home / 6,989.80-9,642.75-4,155.57

Finding the Fourth Proportional to 6,989.80, 9,642.75 and 4,155.57

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Solution

The fourth proportional to 6,989.80, 9,642.75 and 4,155.57 is: 5,732.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,989.80 : 9,642.75 = 4,155.57 : x
  2. Step 2: Convert to fraction form
    6,989.80/9,642.75 = 4,155.57/x
  3. Step 3: Cross multiply
    6,989.80x = 9,642.75 × 4,155.57
  4. Step 4: Simplify right side
    6,989.80x = 40,071,134.53
  5. Step 5: Solve for x
    x = 40,071,134.53/6,989.80
  6. Step 6: Final answer
    x = 5,732.80

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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.