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Finding the Fourth Proportional to 390,718, 539,191.20 and 211,870

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Solution

The fourth proportional to 390,718, 539,191.20 and 211,870 is: 292,380.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,718 : 539,191.20 = 211,870 : x
  2. Step 2: Convert to fraction form
    390,718/539,191.20 = 211,870/x
  3. Step 3: Cross multiply
    390,718x = 539,191.20 × 211,870
  4. Step 4: Simplify right side
    390,718x = 114,238,439,544.00
  5. Step 5: Solve for x
    x = 114,238,439,544.00/390,718
  6. Step 6: Final answer
    x = 292,380.80

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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.