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Finding the Fourth Proportional to 5,142.99, 7,712.90 and 1,855.67

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Solution

The fourth proportional to 5,142.99, 7,712.90 and 1,855.67 is: 2,782.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,142.99 : 7,712.90 = 1,855.67 : x
  2. Step 2: Convert to fraction form
    5,142.99/7,712.90 = 1,855.67/x
  3. Step 3: Cross multiply
    5,142.99x = 7,712.90 × 1,855.67
  4. Step 4: Simplify right side
    5,142.99x = 14,312,549.30
  5. Step 5: Solve for x
    x = 14,312,549.30/5,142.99
  6. Step 6: Final answer
    x = 2,782.92

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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.