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Finding the Fourth Proportional to 47,279.70, 70,919.55 and 42,905.70

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Solution

The fourth proportional to 47,279.70, 70,919.55 and 42,905.70 is: 64,358.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    47,279.70 : 70,919.55 = 42,905.70 : x
  2. Step 2: Convert to fraction form
    47,279.70/70,919.55 = 42,905.70/x
  3. Step 3: Cross multiply
    47,279.70x = 70,919.55 × 42,905.70
  4. Step 4: Simplify right side
    47,279.70x = 3,042,852,936.44
  5. Step 5: Solve for x
    x = 3,042,852,936.44/47,279.70
  6. Step 6: Final answer
    x = 64,358.55

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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.