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Finding the Fourth Proportional to 390,904.89, 539,449.79 and 212,056.89

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Solution

The fourth proportional to 390,904.89, 539,449.79 and 212,056.89 is: 292,639.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,904.89 : 539,449.79 = 212,056.89 : x
  2. Step 2: Convert to fraction form
    390,904.89/539,449.79 = 212,056.89/x
  3. Step 3: Cross multiply
    390,904.89x = 539,449.79 × 212,056.89
  4. Step 4: Simplify right side
    390,904.89x = 114,394,044,778.55
  5. Step 5: Solve for x
    x = 114,394,044,778.55/390,904.89
  6. Step 6: Final answer
    x = 292,639.07

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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.