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Finding the Fourth Proportional to 390,910.50, 539,178.38 and 358,748.96

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Solution

The fourth proportional to 390,910.50, 539,178.38 and 358,748.96 is: 494,818.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,910.50 : 539,178.38 = 358,748.96 : x
  2. Step 2: Convert to fraction form
    390,910.50/539,178.38 = 358,748.96/x
  3. Step 3: Cross multiply
    390,910.50x = 539,178.38 × 358,748.96
  4. Step 4: Simplify right side
    390,910.50x = 193,429,684,427.43
  5. Step 5: Solve for x
    x = 193,429,684,427.43/390,910.50
  6. Step 6: Final answer
    x = 494,818.34

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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.