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Finding the Fourth Proportional to 210,387.84, 315,513.60 and 70,108.80

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Solution

The fourth proportional to 210,387.84, 315,513.60 and 70,108.80 is: 105,140.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,387.84 : 315,513.60 = 70,108.80 : x
  2. Step 2: Convert to fraction form
    210,387.84/315,513.60 = 70,108.80/x
  3. Step 3: Cross multiply
    210,387.84x = 315,513.60 × 70,108.80
  4. Step 4: Simplify right side
    210,387.84x = 22,120,279,879.68
  5. Step 5: Solve for x
    x = 22,120,279,879.68/210,387.84
  6. Step 6: Final answer
    x = 105,140.49

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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.