Home / 3,990.08-5,509.28-2,420.30

Finding the Fourth Proportional to 3,990.08, 5,509.28 and 2,420.30

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Solution

The fourth proportional to 3,990.08, 5,509.28 and 2,420.30 is: 3,341.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,990.08 : 5,509.28 = 2,420.30 : x
  2. Step 2: Convert to fraction form
    3,990.08/5,509.28 = 2,420.30/x
  3. Step 3: Cross multiply
    3,990.08x = 5,509.28 × 2,420.30
  4. Step 4: Simplify right side
    3,990.08x = 13,334,110.38
  5. Step 5: Solve for x
    x = 13,334,110.38/3,990.08
  6. Step 6: Final answer
    x = 3,341.82

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.