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Finding the Fourth Proportional to 390,173.37, 538,437.69 and 218,091.14

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Solution

The fourth proportional to 390,173.37, 538,437.69 and 218,091.14 is: 300,964.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,173.37 : 538,437.69 = 218,091.14 : x
  2. Step 2: Convert to fraction form
    390,173.37/538,437.69 = 218,091.14/x
  3. Step 3: Cross multiply
    390,173.37x = 538,437.69 × 218,091.14
  4. Step 4: Simplify right side
    390,173.37x = 117,428,491,373.35
  5. Step 5: Solve for x
    x = 117,428,491,373.35/390,173.37
  6. Step 6: Final answer
    x = 300,964.91

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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.