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Finding the Fourth Proportional to 210,331.40, 315,497.10 and 127,387.40

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Solution

The fourth proportional to 210,331.40, 315,497.10 and 127,387.40 is: 191,081.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,331.40 : 315,497.10 = 127,387.40 : x
  2. Step 2: Convert to fraction form
    210,331.40/315,497.10 = 127,387.40/x
  3. Step 3: Cross multiply
    210,331.40x = 315,497.10 × 127,387.40
  4. Step 4: Simplify right side
    210,331.40x = 40,190,355,276.54
  5. Step 5: Solve for x
    x = 40,190,355,276.54/210,331.40
  6. Step 6: Final answer
    x = 191,081.10

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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.