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Finding the Fourth Proportional to 390,555.67, 538,941.40 and 218,443.81

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Solution

The fourth proportional to 390,555.67, 538,941.40 and 218,443.81 is: 301,438.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,555.67 : 538,941.40 = 218,443.81 : x
  2. Step 2: Convert to fraction form
    390,555.67/538,941.40 = 218,443.81/x
  3. Step 3: Cross multiply
    390,555.67x = 538,941.40 × 218,443.81
  4. Step 4: Simplify right side
    390,555.67x = 117,728,412,782.73
  5. Step 5: Solve for x
    x = 117,728,412,782.73/390,555.67
  6. Step 6: Final answer
    x = 301,438.24

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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.