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Finding the Fourth Proportional to 7,124.79, 10,687.18 and 1,859.78

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Solution

The fourth proportional to 7,124.79, 10,687.18 and 1,859.78 is: 2,789.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,124.79 : 10,687.18 = 1,859.78 : x
  2. Step 2: Convert to fraction form
    7,124.79/10,687.18 = 1,859.78/x
  3. Step 3: Cross multiply
    7,124.79x = 10,687.18 × 1,859.78
  4. Step 4: Simplify right side
    7,124.79x = 19,875,836.15
  5. Step 5: Solve for x
    x = 19,875,836.15/7,124.79
  6. Step 6: Final answer
    x = 2,789.67

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Similar ratio
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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.