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Finding the Fourth Proportional to 77,479.50, 106,939.96 and 47,289.78

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Solution

The fourth proportional to 77,479.50, 106,939.96 and 47,289.78 is: 65,271.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,479.50 : 106,939.96 = 47,289.78 : x
  2. Step 2: Convert to fraction form
    77,479.50/106,939.96 = 47,289.78/x
  3. Step 3: Cross multiply
    77,479.50x = 106,939.96 × 47,289.78
  4. Step 4: Simplify right side
    77,479.50x = 5,057,167,181.61
  5. Step 5: Solve for x
    x = 5,057,167,181.61/77,479.50
  6. Step 6: Final answer
    x = 65,271.04

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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.