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Finding the Fourth Proportional to 210,005.20, 315,007.80 and 76,889.80

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Solution

The fourth proportional to 210,005.20, 315,007.80 and 76,889.80 is: 115,334.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,005.20 : 315,007.80 = 76,889.80 : x
  2. Step 2: Convert to fraction form
    210,005.20/315,007.80 = 76,889.80/x
  3. Step 3: Cross multiply
    210,005.20x = 315,007.80 × 76,889.80
  4. Step 4: Simplify right side
    210,005.20x = 24,220,886,740.44
  5. Step 5: Solve for x
    x = 24,220,886,740.44/210,005.20
  6. Step 6: Final answer
    x = 115,334.70

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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.