Home / 13,639.04-20,461.20-5,318.72

Finding the Fourth Proportional to 13,639.04, 20,461.20 and 5,318.72

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Solution

The fourth proportional to 13,639.04, 20,461.20 and 5,318.72 is: 7,979.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,639.04 : 20,461.20 = 5,318.72 : x
  2. Step 2: Convert to fraction form
    13,639.04/20,461.20 = 5,318.72/x
  3. Step 3: Cross multiply
    13,639.04x = 20,461.20 × 5,318.72
  4. Step 4: Simplify right side
    13,639.04x = 108,827,393.66
  5. Step 5: Solve for x
    x = 108,827,393.66/13,639.04
  6. Step 6: Final answer
    x = 7,979.11

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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.