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Finding the Fourth Proportional to 210,053.60, 315,123.60 and 69,912.80

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Solution

The fourth proportional to 210,053.60, 315,123.60 and 69,912.80 is: 104,883.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,053.60 : 315,123.60 = 69,912.80 : x
  2. Step 2: Convert to fraction form
    210,053.60/315,123.60 = 69,912.80/x
  3. Step 3: Cross multiply
    210,053.60x = 315,123.60 × 69,912.80
  4. Step 4: Simplify right side
    210,053.60x = 22,031,173,222.08
  5. Step 5: Solve for x
    x = 22,031,173,222.08/210,053.60
  6. Step 6: Final answer
    x = 104,883.58

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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.