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Finding the Fourth Proportional to 100,685.40, 150,855.30 and 47,981.40

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Solution

The fourth proportional to 100,685.40, 150,855.30 and 47,981.40 is: 71,889.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,685.40 : 150,855.30 = 47,981.40 : x
  2. Step 2: Convert to fraction form
    100,685.40/150,855.30 = 47,981.40/x
  3. Step 3: Cross multiply
    100,685.40x = 150,855.30 × 47,981.40
  4. Step 4: Simplify right side
    100,685.40x = 7,238,248,491.42
  5. Step 5: Solve for x
    x = 7,238,248,491.42/100,685.40
  6. Step 6: Final answer
    x = 71,889.75

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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.