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Finding the Fourth Proportional to 5,158.40, 7,118.40 and 2,919.92

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Solution

The fourth proportional to 5,158.40, 7,118.40 and 2,919.92 is: 4,029.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,158.40 : 7,118.40 = 2,919.92 : x
  2. Step 2: Convert to fraction form
    5,158.40/7,118.40 = 2,919.92/x
  3. Step 3: Cross multiply
    5,158.40x = 7,118.40 × 2,919.92
  4. Step 4: Simplify right side
    5,158.40x = 20,785,158.53
  5. Step 5: Solve for x
    x = 20,785,158.53/5,158.40
  6. Step 6: Final answer
    x = 4,029.38

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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.