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Finding the Fourth Proportional to 210,179.80, 315,269.70 and 121,606.30

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Solution

The fourth proportional to 210,179.80, 315,269.70 and 121,606.30 is: 182,409.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,179.80 : 315,269.70 = 121,606.30 : x
  2. Step 2: Convert to fraction form
    210,179.80/315,269.70 = 121,606.30/x
  3. Step 3: Cross multiply
    210,179.80x = 315,269.70 × 121,606.30
  4. Step 4: Simplify right side
    210,179.80x = 38,338,781,719.11
  5. Step 5: Solve for x
    x = 38,338,781,719.11/210,179.80
  6. Step 6: Final answer
    x = 182,409.45

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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.