Home / 2,420.12-3,630.18-688.75

Finding the Fourth Proportional to 2,420.12, 3,630.18 and 688.75

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Solution

The fourth proportional to 2,420.12, 3,630.18 and 688.75 is: 1,033.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,420.12 : 3,630.18 = 688.75 : x
  2. Step 2: Convert to fraction form
    2,420.12/3,630.18 = 688.75/x
  3. Step 3: Cross multiply
    2,420.12x = 3,630.18 × 688.75
  4. Step 4: Simplify right side
    2,420.12x = 2,500,277.40
  5. Step 5: Solve for x
    x = 2,500,277.40/2,420.12
  6. Step 6: Final answer
    x = 1,033.12

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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.