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Finding the Fourth Proportional to 2,390.87, 3,586.10 and 830.75

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Solution

The fourth proportional to 2,390.87, 3,586.10 and 830.75 is: 1,246.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,390.87 : 3,586.10 = 830.75 : x
  2. Step 2: Convert to fraction form
    2,390.87/3,586.10 = 830.75/x
  3. Step 3: Cross multiply
    2,390.87x = 3,586.10 × 830.75
  4. Step 4: Simplify right side
    2,390.87x = 2,979,130.49
  5. Step 5: Solve for x
    x = 2,979,130.49/2,390.87
  6. Step 6: Final answer
    x = 1,246.05

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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.