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Finding the Fourth Proportional to 378,123.48, 521,459.78 and 275,987.24

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Solution

The fourth proportional to 378,123.48, 521,459.78 and 275,987.24 is: 380,606.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    378,123.48 : 521,459.78 = 275,987.24 : x
  2. Step 2: Convert to fraction form
    378,123.48/521,459.78 = 275,987.24/x
  3. Step 3: Cross multiply
    378,123.48x = 521,459.78 × 275,987.24
  4. Step 4: Simplify right side
    378,123.48x = 143,916,245,453.21
  5. Step 5: Solve for x
    x = 143,916,245,453.21/378,123.48
  6. Step 6: Final answer
    x = 380,606.48

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.