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Finding the Fourth Proportional to 390,174.37, 538,439.07 and 218,092.14

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Solution

The fourth proportional to 390,174.37, 538,439.07 and 218,092.14 is: 300,966.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,174.37 : 538,439.07 = 218,092.14 : x
  2. Step 2: Convert to fraction form
    390,174.37/538,439.07 = 218,092.14/x
  3. Step 3: Cross multiply
    390,174.37x = 538,439.07 × 218,092.14
  4. Step 4: Simplify right side
    390,174.37x = 117,429,329,035.91
  5. Step 5: Solve for x
    x = 117,429,329,035.91/390,174.37
  6. Step 6: Final answer
    x = 300,966.28

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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.