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Finding the Fourth Proportional to 210,211.12, 315,321 and 69,970.96

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Solution

The fourth proportional to 210,211.12, 315,321 and 69,970.96 is: 104,957.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,211.12 : 315,321 = 69,970.96 : x
  2. Step 2: Convert to fraction form
    210,211.12/315,321 = 69,970.96/x
  3. Step 3: Cross multiply
    210,211.12x = 315,321 × 69,970.96
  4. Step 4: Simplify right side
    210,211.12x = 22,063,313,078.16
  5. Step 5: Solve for x
    x = 22,063,313,078.16/210,211.12
  6. Step 6: Final answer
    x = 104,957.88

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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.