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Finding the Fourth Proportional to 390,511.71, 538,956.08 and 218,439.23

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Solution

The fourth proportional to 390,511.71, 538,956.08 and 218,439.23 is: 301,474.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,511.71 : 538,956.08 = 218,439.23 : x
  2. Step 2: Convert to fraction form
    390,511.71/538,956.08 = 218,439.23/x
  3. Step 3: Cross multiply
    390,511.71x = 538,956.08 × 218,439.23
  4. Step 4: Simplify right side
    390,511.71x = 117,729,147,332.04
  5. Step 5: Solve for x
    x = 117,729,147,332.04/390,511.71
  6. Step 6: Final answer
    x = 301,474.05

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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.