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Finding the Fourth Proportional to 2,931.19, 4,396.78 and 879.19

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Solution

The fourth proportional to 2,931.19, 4,396.78 and 879.19 is: 1,318.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,931.19 : 4,396.78 = 879.19 : x
  2. Step 2: Convert to fraction form
    2,931.19/4,396.78 = 879.19/x
  3. Step 3: Cross multiply
    2,931.19x = 4,396.78 × 879.19
  4. Step 4: Simplify right side
    2,931.19x = 3,865,595.12
  5. Step 5: Solve for x
    x = 3,865,595.12/2,931.19
  6. Step 6: Final answer
    x = 1,318.78

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.