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Finding the Fourth Proportional to 18,457.79, 27,685.71 and 5,309.64

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Solution

The fourth proportional to 18,457.79, 27,685.71 and 5,309.64 is: 7,964.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,457.79 : 27,685.71 = 5,309.64 : x
  2. Step 2: Convert to fraction form
    18,457.79/27,685.71 = 5,309.64/x
  3. Step 3: Cross multiply
    18,457.79x = 27,685.71 × 5,309.64
  4. Step 4: Simplify right side
    18,457.79x = 147,001,153.24
  5. Step 5: Solve for x
    x = 147,001,153.24/18,457.79
  6. Step 6: Final answer
    x = 7,964.18

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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.