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Finding the Fourth Proportional to 390,744.59, 539,108.48 and 218,644.70

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Solution

The fourth proportional to 390,744.59, 539,108.48 and 218,644.70 is: 301,663.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,744.59 : 539,108.48 = 218,644.70 : x
  2. Step 2: Convert to fraction form
    390,744.59/539,108.48 = 218,644.70/x
  3. Step 3: Cross multiply
    390,744.59x = 539,108.48 × 218,644.70
  4. Step 4: Simplify right side
    390,744.59x = 117,873,210,783.83
  5. Step 5: Solve for x
    x = 117,873,210,783.83/390,744.59
  6. Step 6: Final answer
    x = 301,663.07

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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.