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Finding the Fourth Proportional to 18,642.79, 25,730.76 and 10,690.39

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Solution

The fourth proportional to 18,642.79, 25,730.76 and 10,690.39 is: 14,754.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,642.79 : 25,730.76 = 10,690.39 : x
  2. Step 2: Convert to fraction form
    18,642.79/25,730.76 = 10,690.39/x
  3. Step 3: Cross multiply
    18,642.79x = 25,730.76 × 10,690.39
  4. Step 4: Simplify right side
    18,642.79x = 275,071,859.40
  5. Step 5: Solve for x
    x = 275,071,859.40/18,642.79
  6. Step 6: Final answer
    x = 14,754.87

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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.