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Finding the Fourth Proportional to 390,924.96, 539,918.40 and 263,378.88

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Solution

The fourth proportional to 390,924.96, 539,918.40 and 263,378.88 is: 363,760.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,924.96 : 539,918.40 = 263,378.88 : x
  2. Step 2: Convert to fraction form
    390,924.96/539,918.40 = 263,378.88/x
  3. Step 3: Cross multiply
    390,924.96x = 539,918.40 × 263,378.88
  4. Step 4: Simplify right side
    390,924.96x = 142,203,103,483.39
  5. Step 5: Solve for x
    x = 142,203,103,483.39/390,924.96
  6. Step 6: Final answer
    x = 363,760.61

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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.