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Finding the Fourth Proportional to 20,602.70, 30,730.85 and 18,710.72

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Solution

The fourth proportional to 20,602.70, 30,730.85 and 18,710.72 is: 27,908.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,602.70 : 30,730.85 = 18,710.72 : x
  2. Step 2: Convert to fraction form
    20,602.70/30,730.85 = 18,710.72/x
  3. Step 3: Cross multiply
    20,602.70x = 30,730.85 × 18,710.72
  4. Step 4: Simplify right side
    20,602.70x = 574,996,176.06
  5. Step 5: Solve for x
    x = 574,996,176.06/20,602.70
  6. Step 6: Final answer
    x = 27,908.78

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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.