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Finding the Fourth Proportional to 8,985.28, 12,399.84 and 5,448.64

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Solution

The fourth proportional to 8,985.28, 12,399.84 and 5,448.64 is: 7,519.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,985.28 : 12,399.84 = 5,448.64 : x
  2. Step 2: Convert to fraction form
    8,985.28/12,399.84 = 5,448.64/x
  3. Step 3: Cross multiply
    8,985.28x = 12,399.84 × 5,448.64
  4. Step 4: Simplify right side
    8,985.28x = 67,562,264.22
  5. Step 5: Solve for x
    x = 67,562,264.22/8,985.28
  6. Step 6: Final answer
    x = 7,519.22

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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.