Home / 3,120.35-4,680.51-899.40

Finding the Fourth Proportional to 3,120.35, 4,680.51 and 899.40

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Solution

The fourth proportional to 3,120.35, 4,680.51 and 899.40 is: 1,349.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,120.35 : 4,680.51 = 899.40 : x
  2. Step 2: Convert to fraction form
    3,120.35/4,680.51 = 899.40/x
  3. Step 3: Cross multiply
    3,120.35x = 4,680.51 × 899.40
  4. Step 4: Simplify right side
    3,120.35x = 4,209,650.69
  5. Step 5: Solve for x
    x = 4,209,650.69/3,120.35
  6. Step 6: Final answer
    x = 1,349.10

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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.