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Finding the Fourth Proportional to 3,459.79, 5,189.69 and 862.72

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Solution

The fourth proportional to 3,459.79, 5,189.69 and 862.72 is: 1,294.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,459.79 : 5,189.69 = 862.72 : x
  2. Step 2: Convert to fraction form
    3,459.79/5,189.69 = 862.72/x
  3. Step 3: Cross multiply
    3,459.79x = 5,189.69 × 862.72
  4. Step 4: Simplify right side
    3,459.79x = 4,477,249.36
  5. Step 5: Solve for x
    x = 4,477,249.36/3,459.79
  6. Step 6: Final answer
    x = 1,294.08

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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.