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Finding the Fourth Proportional to 12,740.79, 18,982.02 and 12,113.42

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Solution

The fourth proportional to 12,740.79, 18,982.02 and 12,113.42 is: 18,047.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,740.79 : 18,982.02 = 12,113.42 : x
  2. Step 2: Convert to fraction form
    12,740.79/18,982.02 = 12,113.42/x
  3. Step 3: Cross multiply
    12,740.79x = 18,982.02 × 12,113.42
  4. Step 4: Simplify right side
    12,740.79x = 229,937,085.80
  5. Step 5: Solve for x
    x = 229,937,085.80/12,740.79
  6. Step 6: Final answer
    x = 18,047.32

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.