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Finding the Fourth Proportional to 210,057.60, 315,129.60 and 69,916.80

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Solution

The fourth proportional to 210,057.60, 315,129.60 and 69,916.80 is: 104,889.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,057.60 : 315,129.60 = 69,916.80 : x
  2. Step 2: Convert to fraction form
    210,057.60/315,129.60 = 69,916.80/x
  3. Step 3: Cross multiply
    210,057.60x = 315,129.60 × 69,916.80
  4. Step 4: Simplify right side
    210,057.60x = 22,032,853,217.28
  5. Step 5: Solve for x
    x = 22,032,853,217.28/210,057.60
  6. Step 6: Final answer
    x = 104,889.58

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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.