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Finding the Fourth Proportional to 18,873.40, 28,318.20 and 9,639.40

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Solution

The fourth proportional to 18,873.40, 28,318.20 and 9,639.40 is: 14,463.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,873.40 : 28,318.20 = 9,639.40 : x
  2. Step 2: Convert to fraction form
    18,873.40/28,318.20 = 9,639.40/x
  3. Step 3: Cross multiply
    18,873.40x = 28,318.20 × 9,639.40
  4. Step 4: Simplify right side
    18,873.40x = 272,970,457.08
  5. Step 5: Solve for x
    x = 272,970,457.08/18,873.40
  6. Step 6: Final answer
    x = 14,463.24

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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.