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Finding the Fourth Proportional to 390,778.88, 539,274.85 and 221,009.36

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Solution

The fourth proportional to 390,778.88, 539,274.85 and 221,009.36 is: 304,992.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,778.88 : 539,274.85 = 221,009.36 : x
  2. Step 2: Convert to fraction form
    390,778.88/539,274.85 = 221,009.36/x
  3. Step 3: Cross multiply
    390,778.88x = 539,274.85 × 221,009.36
  4. Step 4: Simplify right side
    390,778.88x = 119,184,786,213.70
  5. Step 5: Solve for x
    x = 119,184,786,213.70/390,778.88
  6. Step 6: Final answer
    x = 304,992.91

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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.